使用 API 管理提醒政策

本页说明了如何使用 Stackdriver Monitoring API 以编程方式创建和管理提醒政策,还说明了如何使用 Cloud SDK 命令行界面来管理提醒政策。

许多此类任务都可以通过使用 Stackdriver Monitoring 控制台来执行。如需了解如何使用 Stackdriver Monitoring 控制台创建和管理提醒政策,请参阅使用提醒政策

开始之前

在针对该 API 编写代码之前,您应该满足以下条件:

  • 具备一个工作区,它监控要对其创建提醒政策的项目。
  • 熟悉提醒政策的一般概念和所用术语;详情可参阅提醒功能简介
  • 确保该 API 已启用;详情可参阅启用 API
  • 安装要使用的语言的客户端库;详情可参阅客户端库。目前,此 API 仅支持针对 C#、Go、Java、Node.js 和 Python 的提醒。

  • 安装 Cloud SDK。您可以通过 Cloud SDK 访问 gcloud 命令行界面,并从该界面执行这些任务。如果您使用的是 Cloud Shell,则无需安装 Cloud SDK。

    此处还提供了使用 gcloud 界面的示例。请注意,gcloud 示例都假设当前项目已被设置为目标 (gcloud config set project [PROJECT_ID]),因此调用中省略了显式 --project 标志。示例中当前项目的 ID 是 a-gcp-project

关于提醒政策

提醒政策由 AlertPolicy 对象表示,该对象描述一组指示系统可能存在非正常状况的条件。提醒政策会引用通知渠道,您可通过后者指定在提醒政策被触发时获取通知的方式。

每个提醒政策都属于一个单独的工作区,每个工作区最多可以包含 500 个政策。工作区由其 ID 标识,它在参考资料中被称称作“项目 ID”。在这些示例中,工作区的 ID 为 a-gcp-project

AlertPolicy 资源支持 5 种操作:

  • 创建新政策
  • 删除现有政策
  • 检索特定政策
  • 检索所有政策
  • 修改现有政策

提醒政策可用 JSON 或 YAML 格式,它允许您以文件的形式记录政策,并使用文件来备份和恢复政策。通过 Cloud SDK,您可以使用上述两种格式的文件中的任意一种来创建政策。通过 REST API,您可以从 JSON 文件创建政策。请参阅示例政策,查看 JSON 格式的提醒政策的精选示例。

以下示例使用 gcloud 界面和 API 来演示说明这些基本使用场景。此处的 API 示例摘录自一个示例程序,该程序通过 API 实现用于提醒政策的备份和恢复系统。示例:备份和恢复中显示了更完整的示例。

创建政策

要在项目中创建提醒政策,请使用 alertPolicies.create 方法。

您可以利用 JSON 或 YAML 文件创建政策。gcloud 命令行界面接受这些文件作为参数,而且您可以通过编程方式读取 JSON 文件,将其转换为 AlertPolicy 对象,然后使用 alertPolicies.create 方法根据这些对象创建政策。

以下示例演示说明了创建提醒政策的过程。

GCLOUD 命令

要在项目中创建提醒政策,请使用 gcloud alpha monitoring policies create 命令。以下示例利用 rising-cpu-usage.json 文件在 a-gcp-project 中创建了提醒政策:

gcloud alpha monitoring policies create --policy-from-file="rising-cpu-usage.json"

如果成功,则该命令将返回新政策的名称,例如:

Created alert policy [projects/a-gcp-project/alertPolicies/12669073143329903307].

rising-cpu-usage.json 文件包含了显示名称为“High CPU rate of change”的政策的 JSON 代码。变化率政策中说明了这项政策。

如需了解详情,请参阅 gcloud alpha monitoring policies create 参考。

C#

static void RestorePolicies(string projectId, string filePath)
{
    var policyClient = AlertPolicyServiceClient.Create();
    var channelClient = NotificationChannelServiceClient.Create();
    List<Exception> exceptions = new List<Exception>();
    var backup = JsonConvert.DeserializeObject<BackupRecord>(
        File.ReadAllText(filePath), new ProtoMessageConverter());
    var projectName = new ProjectName(projectId);
    bool isSameProject = projectId == backup.ProjectId;
    // When a channel is recreated, rather than updated, it will get
    // a new name.  We have to update the AlertPolicy with the new
    // name.  Track the names in this map.
    var channelNameMap = new Dictionary<string, string>();
    foreach (NotificationChannel channel in backup.Channels)
    {
    }
    foreach (AlertPolicy policy in backup.Policies)
    {
        string policyName = policy.Name;
        // These two fields cannot be set directly, so clear them.
        policy.CreationRecord = null;
        policy.MutationRecord = null;
        // Update channel names if the channel was recreated with
        // another name.
        for (int i = 0; i < policy.NotificationChannels.Count; ++i)
        {
            if (channelNameMap.ContainsKey(policy.NotificationChannels[i]))
            {
                policy.NotificationChannels[i] =
                    channelNameMap[policy.NotificationChannels[i]];
            }
        }
        try
        {
            Console.WriteLine("Updating policy.\n{0}",
                policy.DisplayName);
            bool updated = false;
            if (isSameProject)
                try
                {
                    policyClient.UpdateAlertPolicy(null, policy);
                    updated = true;
                }
                catch (Grpc.Core.RpcException e)
                when (e.Status.StatusCode == StatusCode.NotFound)
                { }
            if (!updated)
            {
                // The policy no longer exists.  Recreate it.
                policy.Name = null;
                foreach (var condition in policy.Conditions)
                {
                    condition.Name = null;
                }
                policyClient.CreateAlertPolicy(projectName, policy);
            }
            Console.WriteLine("Restored {0}.", policyName);
        }
        catch (Exception e)
        {
            // If one failed, continue trying to update the others.
            exceptions.Add(e);
        }
    }
    if (exceptions.Count > 0)
    {
        throw new AggregateException(exceptions);
    }
}

Go

// restorePolicies updates the project with the alert policies and
// notification channels in r.
func restorePolicies(w io.Writer, projectID string, r io.Reader) error {
	b := backup{}
	if err := json.NewDecoder(r).Decode(&b); err != nil {
		return err
	}
	sameProject := projectID == b.ProjectID

	ctx := context.Background()

	alertClient, err := monitoring.NewAlertPolicyClient(ctx)
	if err != nil {
		return err
	}
	channelClient, err := monitoring.NewNotificationChannelClient(ctx)
	if err != nil {
		return err
	}

	// When a channel is recreated, rather than updated, it will get
	// a new name.  We have to update the AlertPolicy with the new
	// name.  channelNames keeps track of the new names.
	channelNames := make(map[string]string)
	for _, c := range b.Channels {
		fmt.Fprintf(w, "Updating channel %q\n", c.GetDisplayName())
		c.VerificationStatus = monitoringpb.NotificationChannel_VERIFICATION_STATUS_UNSPECIFIED
		updated := false
		if sameProject {
			req := &monitoringpb.UpdateNotificationChannelRequest{
				NotificationChannel: c.NotificationChannel,
			}
			_, err := channelClient.UpdateNotificationChannel(ctx, req)
			if err == nil {
				updated = true
			}
		}
		if !updated {
			req := &monitoringpb.CreateNotificationChannelRequest{
				Name:                "projects/" + projectID,
				NotificationChannel: c.NotificationChannel,
			}
			oldName := c.GetName()
			c.Name = ""
			newC, err := channelClient.CreateNotificationChannel(ctx, req)
			if err != nil {
				return err
			}
			channelNames[oldName] = newC.GetName()
		}
	}

	for _, policy := range b.AlertPolicies {
		fmt.Fprintf(w, "Updating alert %q\n", policy.GetDisplayName())
		policy.CreationRecord = nil
		policy.MutationRecord = nil
		for i, aChannel := range policy.GetNotificationChannels() {
			if c, ok := channelNames[aChannel]; ok {
				policy.NotificationChannels[i] = c
			}
		}
		updated := false
		if sameProject {
			req := &monitoringpb.UpdateAlertPolicyRequest{
				AlertPolicy: policy.AlertPolicy,
			}
			_, err := alertClient.UpdateAlertPolicy(ctx, req)
			if err == nil {
				updated = true
			}
		}
		if !updated {
			req := &monitoringpb.CreateAlertPolicyRequest{
				Name:        "projects/" + projectID,
				AlertPolicy: policy.AlertPolicy,
			}
			if _, err = alertClient.CreateAlertPolicy(ctx, req); err != nil {
				log.Fatal(err)
			}
		}
	}
	fmt.Fprintf(w, "Successfully restored alerts.")
	return nil
}

Java

private static void restoreRevisedPolicies(
    String projectId,
    boolean isSameProject,
    List<AlertPolicy> policies) throws IOException {
  try (AlertPolicyServiceClient client = AlertPolicyServiceClient.create()) {
    for (AlertPolicy policy : policies) {
      if (!isSameProject) {
        policy = client.createAlertPolicy(ProjectName.of(projectId), policy);
      } else {
        try {
          client.updateAlertPolicy(null, policy);
        } catch (Exception e) {
          policy = client.createAlertPolicy(
              ProjectName.of(projectId),
              policy.toBuilder().clearName().build());
        }
      }
      System.out.println(String.format("Restored %s", policy.getName()));
    }
  }
}

Node.js

const fs = require('fs');

// Imports the Google Cloud client library
const monitoring = require('@google-cloud/monitoring');

// Creates a client
const client = new monitoring.AlertPolicyServiceClient();

/**
 * TODO(developer): Uncomment the following lines before running the sample.
 */
// const projectId = 'YOUR_PROJECT_ID';

console.log('Loading policies from ./policies_backup.json');
const fileContent = fs.readFileSync('./policies_backup.json', 'utf-8');
const policies = JSON.parse(fileContent);

for (const index in policies) {
  // Restore each policy one at a time
  let policy = policies[index];
  if (await doesAlertPolicyExist(policy.name)) {
    policy = await client.updateAlertPolicy({alertPolicy: policy});
  } else {
    // Clear away output-only fields
    delete policy.name;
    delete policy.creationRecord;
    delete policy.mutationRecord;
    policy.conditions.forEach(condition => delete condition.name);

    policy = await client.createAlertPolicy({
      name: client.projectPath(projectId),
      alertPolicy: policy,
    });
  }

  console.log(`Restored ${policy[0].name}.`);
}
async function doesAlertPolicyExist(name) {
  try {
    const [policy] = await client.getAlertPolicy({name});
    return policy ? true : false;
  } catch (err) {
    if (err && err.code === 5) {
      // Error code 5 comes from the google.rpc.code.NOT_FOUND protobuf
      return false;
    }
    throw err;
  }
}

PHP

use Google\Cloud\Monitoring\V3\AlertPolicyServiceClient;
use Google\Cloud\Monitoring\V3\AlertPolicy;
use Google\Cloud\Monitoring\V3\ComparisonType;
use Google\Cloud\Monitoring\V3\AlertPolicy\Condition;
use Google\Cloud\Monitoring\V3\AlertPolicy\Condition\MetricThreshold;
use Google\Cloud\Monitoring\V3\AlertPolicy\ConditionCombinerType;
use Google\Protobuf\Duration;

/**
 * @param string $projectId Your project ID
 */
function alert_create_policy($projectId)
{
    $alertClient = new AlertPolicyServiceClient([
        'projectId' => $projectId,
    ]);
    $projectName = $alertClient->projectName($projectId);

    $policy = new AlertPolicy();
    $policy->setDisplayName('Test Alert Policy');
    $policy->setCombiner(ConditionCombinerType::PBOR);
    /** @see https://cloud.google.com/monitoring/api/resources for a list of resource.type */
    /** @see https://cloud.google.com/monitoring/api/metrics_gcp for a list of metric.type */
    $policy->setConditions([new Condition([
        'display_name' => 'condition-1',
        'condition_threshold' => new MetricThreshold([
            'filter' => 'resource.type = "gce_instance" AND metric.type = "compute.googleapis.com/instance/cpu/utilization"',
            'duration' => new Duration(['seconds' => '60']),
            'comparison' => ComparisonType::COMPARISON_LT,
        ])
    ])]);

    $policy = $alertClient->createAlertPolicy($projectName, $policy);
    printf('Created alert policy %s' . PHP_EOL, $policy->getName());
}

Python

def restore(project_name):
    print('Loading alert policies and notification channels from backup.json.')
    record = json.load(open('backup.json', 'rt'))
    is_same_project = project_name == record['project_name']
    # Convert dicts to AlertPolicies.
    policies_json = [json.dumps(policy) for policy in record['policies']]
    policies = [google.protobuf.json_format.Parse(
        policy_json, monitoring_v3.types.alert_pb2.AlertPolicy())
        for policy_json in policies_json]
    # Convert dicts to NotificationChannels
    channels_json = [json.dumps(channel) for channel in record['channels']]
    channels = [google.protobuf.json_format.Parse(
        channel_json, monitoring_v3.types.notification_pb2.
        NotificationChannel()) for channel_json in channels_json]

    # Restore the channels.
    channel_client = monitoring_v3.NotificationChannelServiceClient()
    channel_name_map = {}

    for channel in channels:
        updated = False
        print('Updating channel', channel.display_name)
        # This field is immutable and it is illegal to specify a
        # non-default value (UNVERIFIED or VERIFIED) in the
        # Create() or Update() operations.
        channel.verification_status = monitoring_v3.enums.NotificationChannel.\
            VerificationStatus.VERIFICATION_STATUS_UNSPECIFIED

        if is_same_project:
            try:
                channel_client.update_notification_channel(channel)
                updated = True
            except google.api_core.exceptions.NotFound:
                pass  # The channel was deleted.  Create it below.

        if not updated:
            # The channel no longer exists.  Recreate it.
            old_name = channel.name
            channel.ClearField("name")
            new_channel = channel_client.create_notification_channel(
                project_name, channel)
            channel_name_map[old_name] = new_channel.name

    # Restore the alerts
    alert_client = monitoring_v3.AlertPolicyServiceClient()

    for policy in policies:
        print('Updating policy', policy.display_name)
        # These two fields cannot be set directly, so clear them.
        policy.ClearField('creation_record')
        policy.ClearField('mutation_record')

        # Update old channel names with new channel names.
        for i, channel in enumerate(policy.notification_channels):
            new_channel = channel_name_map.get(channel)
            if new_channel:
                policy.notification_channels[i] = new_channel

        updated = False

        if is_same_project:
            try:
                alert_client.update_alert_policy(policy)
                updated = True
            except google.api_core.exceptions.NotFound:
                pass  # The policy was deleted.  Create it below.
            except google.api_core.exceptions.InvalidArgument:
                # Annoying that API throws InvalidArgument when the policy
                # does not exist.  Seems like it should throw NotFound.
                pass  # The policy was deleted.  Create it below.

        if not updated:
            # The policy no longer exists.  Recreate it.
            old_name = policy.name
            policy.ClearField("name")
            for condition in policy.conditions:
                condition.ClearField("name")
            policy = alert_client.create_alert_policy(project_name, policy)
        print('Updated', policy.name)

创建的 AlertPolicy 对象将具有其他字段。该政策本身有 namecreationRecordmutationRecord 字段。此外,政策中的每个条件也都有一个 name。这些字段不能在外部修改,因此不必在创建政策时设置这些字段。创建政策的 JSON 示例里都不包含这些字段,但如果有人在示例创建政策后检索这些政策,则这些字段将出现。

检索政策

要检索项目中的政策列表,请使用 alertPolicies.list 方法。使用此方法可检索政策,并可以对检索到的政策应用一些操作,例如备份这些政策。此方法还支持使用 filterorderBy 选项对检索结果进行限制和排序;具体请参阅排序和过滤

如果您要查找特定政策且知道其名称,则可使用 alertPolicies.get 方法仅检索该政策。政策的名称是 name 字段的值,而不是 AlertPolicy 对象中的 displayName。政策的名称格式为 projects/[PROJECT_ID]/alertPolicies/[POLICY_ID],例如:

projects/a-gcp-project/alertPolicies/12669073143329903307

GCLOUD 命令

要列出项目中所有的提醒政策,请使用 gcloud alpha monitoring policies list 命令:

gcloud alpha monitoring policies list

如果成功,list 命令将以 YAML 格式列出指定项目中的所有政策。例如,a-gcp-project 项目中显示名为 High CPU rate of change 的政策按下述形式显示在政策列表中:

---
combiner: OR
conditions:
- conditionThreshold:
    aggregations:
    - alignmentPeriod: 900s
      perSeriesAligner: ALIGN_PERCENT_CHANGE
    comparison: COMPARISON_GT
    duration: 180s
    filter: metric.type="compute.googleapis.com/instance/cpu/utilization" AND resource.type="gce_instance"
    thresholdValue: 0.5
    trigger:
      count: 1
  displayName: CPU usage is increasing at a high rate
  name: projects/a-gcp-project/alertPolicies/12669073143329903307/conditions/12669073143329903008
creationRecord:
  mutateTime: '2018-03-26T18:52:39.363601689Z'
  mutatedBy: [USER@DOMAIN]
displayName: High CPU rate of change
enabled: true
mutationRecord:
  mutateTime: '2018-03-26T18:52:39.363601689Z'
  mutatedBy: [USER@DOMAIN]
name: projects/a-gcp-project/alertPolicies/12669073143329903307
---

要列出单个提醒政策,请使用 gcloud alpha monitoring policies describe,并指定政策的名称。例如,此命令仅返回上面所列出的政策:

gcloud alpha monitoring policies describe projects/a-gcp-project/alertPolicies/12669073143329903307

如需了解详情,请参阅 gcloud alpha monitoring policies listdescribe 参考。describe 命令与 API 中的 alertPolicies.get 方法相对应。

C#

static void ListAlertPolicies(string projectId)
{
    var client = AlertPolicyServiceClient.Create();
    var response = client.ListAlertPolicies(new ProjectName(projectId));
    foreach (AlertPolicy policy in response)
    {
        Console.WriteLine(policy.Name);
        if (policy.DisplayName != null)
        {
            Console.WriteLine(policy.DisplayName);
        }
        if (policy.Documentation?.Content != null)
        {
            Console.WriteLine(policy.Documentation.Content);
        }
        Console.WriteLine();
    }
}

Go

// listAlertPolicies lists the alert policies in the project.
func listAlertPolicies(w io.Writer, projectID string) error {
	ctx := context.Background()
	client, err := monitoring.NewAlertPolicyClient(ctx)
	if err != nil {
		return err
	}

	req := &monitoringpb.ListAlertPoliciesRequest{
		Name: "projects/" + projectID,
		// Filter:  "", // See https://cloud.google.com/monitoring/api/v3/sorting-and-filtering.
		// OrderBy: "", // See https://cloud.google.com/monitoring/api/v3/sorting-and-filtering.
	}
	it := client.ListAlertPolicies(ctx, req)
	for {
		resp, err := it.Next()
		if err == iterator.Done {
			fmt.Fprintln(w, "Done")
			break
		}
		if err != nil {
			return err
		}
		fmt.Fprintf(w, "  Name: %q\n", resp.GetName())
		fmt.Fprintf(w, "  Display Name: %q\n", resp.GetDisplayName())
		fmt.Fprintf(w, "  Documentation Content: %q\n\n", resp.GetDocumentation().GetContent())
	}
	return nil
}

Java

private static void listAlertPolicies(String projectId) throws IOException {
  try (AlertPolicyServiceClient client = AlertPolicyServiceClient.create()) {
    ListAlertPoliciesPagedResponse response = client.listAlertPolicies(ProjectName.of(projectId));

    System.out.println("Alert Policies:");
    for (AlertPolicy policy : response.iterateAll()) {
      System.out.println(
          String.format("\nPolicy %s\nalert-id: %s", policy.getDisplayName(), policy.getName()));
      int channels = policy.getNotificationChannelsCount();
      if (channels > 0) {
        System.out.println("notification-channels:");
        for (int i = 0; i < channels; i++) {
          System.out.println("\t" + policy.getNotificationChannels(i));
        }
      }
      if (policy.hasDocumentation() && policy.getDocumentation().getContent() != null) {
        System.out.println(policy.getDocumentation().getContent());
      }
    }
  }
}

Node.js

// Imports the Google Cloud client library
const monitoring = require('@google-cloud/monitoring');

// Creates a client
const client = new monitoring.AlertPolicyServiceClient();

/**
 * TODO(developer): Uncomment the following lines before running the sample.
 */
// const projectId = 'YOUR_PROJECT_ID';

const listAlertPoliciesRequest = {
  name: client.projectPath(projectId),
};
const [policies] = await client.listAlertPolicies(listAlertPoliciesRequest);
console.log('Policies:');
policies.forEach(policy => {
  console.log(`  Display name: ${policy.displayName}`);
  if (policy.documentation && policy.documentation.content) {
    console.log(`     Documentation: ${policy.documentation.content}`);
  }
});

PHP

use Google\Cloud\Monitoring\V3\AlertPolicyServiceClient;

/**
 * Adds a new column to the Albums table in the example database.
 * Example:
 * ```
 * alert_list_policies($projectId);
 * ```
 *
 * @param string $projectId Your project ID
 */
function alert_list_policies($projectId)
{
    $alertClient = new AlertPolicyServiceClient([
        'projectId' => $projectId,
    ]);

    $policies = $alertClient->listAlertPolicies(
        $alertClient->projectName($projectId)
    );
    foreach ($policies->iterateAllElements() as $policy) {
        printf('Name: %s (%s)' . PHP_EOL, $policy->getDisplayName(), $policy->getName());
    }
}

Python

def list_alert_policies(project_name):
    client = monitoring_v3.AlertPolicyServiceClient()
    policies = client.list_alert_policies(project_name)
    print(tabulate.tabulate(
        [(policy.name, policy.display_name) for policy in policies],
        ('name', 'display_name')))

删除政策

要从项目中删除政策,请使用 alertPolicies.delete 方法,并提供要删除的提醒政策的名称。

GCLOUD 命令

要删除提醒政策,请使用 gcloud alpha monitoring policies delete,并指定要删除的政策的名称。例如,以下命令将删除 High CPU rate of change 政策:

gcloud alpha monitoring policies delete projects/a-gcp-project/alertPolicies/12669073143329903307

如需了解详情,请参阅 gcloud alpha monitoring policies delete 参考。

修改政策

要修改提醒政策,请使用 REST API 中的 alertPolicies.patch 方法。其他 API 实现和 gcloud 界面称之为 update,而不是 patch

更新操作可以完全替换现有的政策,也可以修改其中一部分字段。要进行更新,您需要使用新的 AlertPolicy 对象并根据情况使用字段掩码

如果指定了一个字段掩码,则字段掩码中列出的所有字段将更新为提供的政策中的值。如果提供的政策中不包括字段掩码中提到的某个字段,则该字段将被清空并设置为默认值。掩码中未列出的任何字段将保留其先前的值。

如果未指定字段掩码,则现有政策将被替换为提供的政策,但沿用原有名称 (projects/[PROJECT_ID]/alertPolicies/[POLICY_ID])。新政策中的任何条件,若有 name 值,且该值中含有 CONDITION_ID,则该条件的名称保留不变。若新政策中的条件不符合上述情形,则将创建新的条件名称和政策名称。

使用 gcloud 命令行更新政策时,指定需要更新的字段是通过使用命令行标志来实现的,而不是使用字段掩码。如需了解详情,请参阅 gcloud alpha monitoring policies update

启用或停用政策

要启用或停用政策,请更改 AlertPolicy 对象中 enabled 字段的布尔值。请注意,在您启用某项政策后,之前在该政策处于停用状态时收集的数据此时仍可能触发提醒。

GCLOUD 命令

要停用提醒政策,请使用 gcloud alpha monitoring policies update 命令并提供 --no-enabled 标志。以下命令将停用 a-gcp-project 项目中的“High CPU rate of change”提醒政策:

gcloud alpha monitoring policies update projects/a-gcp-project/alertPolicies/12669073143329903307 --no-enabled

要启用该政策,请使用同一命令并提供 --enabled 标志。如需了解详情,请参阅 gcloud alpha monitoring policies update 参考。update 命令与 REST API 中的 alertPolicies.patch 方法相对应。

C#

static object EnablePolicies(string projectId, string filter, bool enable)
{
    var client = AlertPolicyServiceClient.Create();
    var request = new ListAlertPoliciesRequest()
    {
        ProjectName = new ProjectName(projectId),
        Filter = filter
    };
    var response = client.ListAlertPolicies(request);
    int result = 0;
    foreach (AlertPolicy policy in response)
    {
        try
        {
            if (policy.Enabled == enable)
            {
                Console.WriteLine("Policy {0} is already {1}.",
                    policy.Name, enable ? "enabled" : "disabled");
                continue;
            }
            policy.Enabled = enable;
            var fieldMask = new FieldMask { Paths = { "enabled" } };
            client.UpdateAlertPolicy(fieldMask, policy);
            Console.WriteLine("{0} {1}.", enable ? "Enabled" : "Disabled",
                policy.Name);
        }
        catch (Grpc.Core.RpcException e)
        when (e.Status.StatusCode == StatusCode.InvalidArgument)
        {
            Console.WriteLine(e.Message);
            result -= 1;
        }
    }
    // Return a negative count of how many enable operations failed.
    return result;
}

Go

// enablePolicies enables or disables all alert policies in the project.
func enablePolicies(w io.Writer, projectID string, enable bool) error {
	ctx := context.Background()

	client, err := monitoring.NewAlertPolicyClient(ctx)
	if err != nil {
		return err
	}

	req := &monitoringpb.ListAlertPoliciesRequest{
		Name: "projects/" + projectID,
		// Filter:  "", // See https://cloud.google.com/monitoring/api/v3/sorting-and-filtering.
		// OrderBy: "", // See https://cloud.google.com/monitoring/api/v3/sorting-and-filtering.
	}
	it := client.ListAlertPolicies(ctx, req)
	for {
		a, err := it.Next()
		if err == iterator.Done {
			break
		}
		if err != nil {
			return err
		}
		if a.GetEnabled().GetValue() == enable {
			fmt.Fprintf(w, "Policy %q already has enabled=%v", a.GetDisplayName(), enable)
			continue
		}
		a.Enabled = &wrappers.BoolValue{Value: enable}
		req := &monitoringpb.UpdateAlertPolicyRequest{
			AlertPolicy: a,
			UpdateMask: &fieldmask.FieldMask{
				Paths: []string{"enabled"},
			},
		}
		if _, err := client.UpdateAlertPolicy(ctx, req); err != nil {
			return err
		}
	}
	fmt.Fprintln(w, "Successfully updated alerts.")
	return nil
}

Java

private static void enablePolicies(String projectId, String filter, boolean enable)
    throws IOException {
  try (AlertPolicyServiceClient client = AlertPolicyServiceClient.create()) {
    ListAlertPoliciesPagedResponse response = client
        .listAlertPolicies(ListAlertPoliciesRequest.newBuilder()
            .setName(ProjectName.of(projectId).toString())
            .setFilter(filter)
            .build());

    for (AlertPolicy policy : response.iterateAll()) {
      if (policy.getEnabled().getValue() == enable) {
        System.out.println(String.format(
            "Policy %s is already %b.", policy.getName(), enable ? "enabled" : "disabled"));
        continue;
      }
      AlertPolicy updatedPolicy = AlertPolicy
          .newBuilder()
          .setName(policy.getName())
          .setEnabled(BoolValue.newBuilder().setValue(enable))
          .build();
      AlertPolicy result = client.updateAlertPolicy(
          FieldMask.newBuilder().addPaths("enabled").build(), updatedPolicy);
      System.out.println(String.format(
          "%s %s",
          result.getDisplayName(),
          result.getEnabled().getValue() ? "enabled" : "disabled"));
    }
  }
}

Node.js

// Imports the Google Cloud client library
const monitoring = require('@google-cloud/monitoring');

// Creates a client
const client = new monitoring.AlertPolicyServiceClient();

/**
 * TODO(developer): Uncomment the following lines before running the sample.
 */
// const projectId = 'YOUR_PROJECT_ID';
// const enabled = true;
// const filter = 'A filter for selecting policies, e.g. description:"cloud"';

const listAlertPoliciesRequest = {
  name: client.projectPath(projectId),
  // See https://cloud.google.com/monitoring/alerting/docs/sorting-and-filtering
  filter: filter,
};

const [policies] = await client.listAlertPolicies(listAlertPoliciesRequest);
const tasks = await Promise.all(
  policies
    .map(policy => {
      return {
        updateMask: {paths: ['disabled']},
        alertPolicy: {
          name: policy.name,
          disabled: enabled ? false : true,
        },
      };
    })
    .map(updateAlertPolicyRequest =>
      client.updateAlertPolicy(updateAlertPolicyRequest)
    )
);
tasks.forEach(response => {
  const alertPolicy = response[0];
  console.log(`${enabled ? 'Enabled' : 'Disabled'} ${alertPolicy.name}.`);
});

PHP

use Google\Cloud\Monitoring\V3\AlertPolicyServiceClient;
use Google\Protobuf\FieldMask;

/**
 * Enable or disable alert policies in a project.
 *
 * @param string $projectId Your project ID
 * @param bool $enable Enable or disable the policies.
 * @param string $filter Only enable/disable alert policies that match a filter.
 *        See https://cloud.google.com/monitoring/api/v3/sorting-and-filtering
 */
function alert_enable_policies($projectId, $enable = true, $filter = null)
{
    $alertClient = new AlertPolicyServiceClient([
        'projectId' => $projectId,
    ]);
    $projectName = $alertClient->projectName($projectId);

    $policies = $alertClient->listAlertPolicies($projectName, [
        'filter' => $filter
    ]);
    foreach ($policies->iterateAllElements() as $policy) {
        $isEnabled = $policy->getEnabled()->getValue();
        if ($enable == $isEnabled) {
            printf('Policy %s is already %s' . PHP_EOL,
                $policy->getName(),
                $isEnabled ? 'enabled' : 'disabled'
            );
        } else {
            $policy->getEnabled()->setValue((bool) $enable);
            $mask = new FieldMask();
            $mask->setPaths(['enabled']);
            $alertClient->updateAlertPolicy($policy, [
                'updateMask' => $mask
            ]);
            printf('%s %s' . PHP_EOL,
                $enable ? 'Enabled' : 'Disabled',
                $policy->getName()
            );
        }
    }
}

Python

def enable_alert_policies(project_name, enable, filter_=None):
    """Enable or disable alert policies in a project.

    Arguments:
        project_name (str)
        enable (bool): Enable or disable the policies.
        filter_ (str, optional): Only enable/disable alert policies that match
            this filter_.  See
            https://cloud.google.com/monitoring/api/v3/sorting-and-filtering
    """

    client = monitoring_v3.AlertPolicyServiceClient()
    policies = client.list_alert_policies(project_name, filter_=filter_)

    for policy in policies:
        if bool(enable) == policy.enabled.value:
            print('Policy', policy.name, 'is already',
                  'enabled' if policy.enabled.value else 'disabled')
        else:
            policy.enabled.value = bool(enable)
            mask = monitoring_v3.types.field_mask_pb2.FieldMask()
            mask.paths.append('enabled')
            client.update_alert_policy(policy, mask)
            print('Enabled' if enable else 'Disabled', policy.name)

更新政策中的通知渠道

您还可以更新提醒政策引用的通知渠道。提醒政策按名称引用通知渠道。提醒政策只能使用已存在的渠道。

您可以通过使用 NotificationChannelNotificationChannelDescriptors 资源以编程方式创建和管理通知渠道。本部分中的这些示例假设这些渠道已经存在,并且程序示例中也展示了这些 API 的使用。

如需查看关于通知渠道对象的更多讨论,请参阅使用 API 管理渠道

GCLOUD 命令

要修改提醒政策中的通知渠道,请使用 gcloud alpha monitoring policies update 命令。与通知渠道相关的标志有几种,您可以使用这些标志删除通知渠道、替换通知渠道、以及添加新的通知渠道。

例如,在项目 a-gcp-project 中创建显示名为 High CPU rate of change 的政策时,没有为该政策创建通知渠道。

要为该政策添加通知渠道,请使用 gcloud alpha monitoring policies update 命令,并使用 --add-notification-channels 标志指定要添加的渠道:

gcloud alpha monitoring policies update projects/a-gcp-project/alertPolicies/12669073143329903307 \
--add-notification-channels="projects/a-gcp-project/notificationChannels/1355376463305411567"

如需了解详情,请参阅 gcloud alpha monitoring policies update 参考。update 命令与 REST API 中的 alertPolicies.patch 方法相对应。

此处添加的通知渠道必须已经存在;详情请参阅创建频道

C#

static void ReplaceChannels(string projectId, string alertPolicyId,
    IEnumerable<string> channelIds)
{
    var alertClient = AlertPolicyServiceClient.Create();
    var policy = new AlertPolicy()
    {
        Name = new AlertPolicyName(projectId, alertPolicyId).ToString()
    };
    foreach (string channelId in channelIds)
    {
        policy.NotificationChannels.Add(
            new NotificationChannelName(projectId, channelId)
            .ToString());
    }
    var response = alertClient.UpdateAlertPolicy(
        new FieldMask { Paths = { "notification_channels" } }, policy);
    Console.WriteLine("Updated {0}.", response.Name);
}

Go

// replaceChannels replaces the notification channels in the alert policy
// with channelIDs.
func replaceChannels(w io.Writer, projectID, alertPolicyID string, channelIDs []string) error {
	ctx := context.Background()

	client, err := monitoring.NewAlertPolicyClient(ctx)
	if err != nil {
		return err
	}

	policy := &monitoringpb.AlertPolicy{
		Name: "projects/" + projectID + "/alertPolicies/" + alertPolicyID,
	}
	for _, c := range channelIDs {
		c = "projects/" + projectID + "/notificationChannels/" + c
		policy.NotificationChannels = append(policy.NotificationChannels, c)
	}
	req := &monitoringpb.UpdateAlertPolicyRequest{
		AlertPolicy: policy,
		UpdateMask: &fieldmask.FieldMask{
			Paths: []string{"notification_channels"},
		},
	}
	if _, err := client.UpdateAlertPolicy(ctx, req); err != nil {
		return fmt.Errorf("UpdateAlertPolicy: %v", err)
	}
	fmt.Fprintf(w, "Successfully replaced channels.")
	return nil
}

Java

private static void replaceChannels(String projectId, String alertPolicyId, String[] channelIds)
    throws IOException {
  AlertPolicy.Builder policyBuilder = AlertPolicy
      .newBuilder()
      .setName(AlertPolicyName.of(projectId, alertPolicyId).toString());
  for (String channelId : channelIds) {
    policyBuilder.addNotificationChannels(
        NotificationChannelName.of(projectId, channelId).toString());
  }
  try (AlertPolicyServiceClient client = AlertPolicyServiceClient.create()) {
    AlertPolicy result = client.updateAlertPolicy(
        FieldMask.newBuilder().addPaths("notification_channels").build(), policyBuilder.build());
    System.out.println(String.format("Updated %s", result.getName()));
  }
}

Node.js

// Imports the Google Cloud client library
const monitoring = require('@google-cloud/monitoring');

// Creates clients
const alertClient = new monitoring.AlertPolicyServiceClient();
const notificationClient = new monitoring.NotificationChannelServiceClient();

/**
 * TODO(developer): Uncomment the following lines before running the sample.
 */
// const projectId = 'YOUR_PROJECT_ID';
// const alertPolicyId = '123456789012314';
// const channelIds = [
//   'channel-1',
//   'channel-2',
//   'channel-3',
// ];

const notificationChannels = channelIds.map(id =>
  notificationClient.notificationChannelPath(projectId, id)
);

for (const channel of notificationChannels) {
  const updateChannelRequest = {
    updateMask: {paths: ['enabled']},
    notificationChannel: {
      name: channel,
      enabled: {value: true},
    },
  };
  try {
    await notificationClient.updateNotificationChannel(updateChannelRequest);
  } catch (err) {
    const createChannelRequest = {
      notificationChannel: {
        name: channel,
        notificationChannel: {type: 'email'},
      },
    };
    const newChannel = await notificationClient.createNotificationChannel(
      createChannelRequest
    );
    notificationChannels.push(newChannel);
  }
}

const updateAlertPolicyRequest = {
  updateMask: {paths: ['notification_channels']},
  alertPolicy: {
    name: alertClient.alertPolicyPath(projectId, alertPolicyId),
    notificationChannels: notificationChannels,
  },
};
const [alertPolicy] = await alertClient.updateAlertPolicy(
  updateAlertPolicyRequest
);
console.log(`Updated ${alertPolicy.name}.`);

PHP

use Google\Cloud\Monitoring\V3\AlertPolicyServiceClient;
use Google\Cloud\Monitoring\V3\NotificationChannelServiceClient;
use Google\Cloud\Monitoring\V3\AlertPolicy;
use Google\Protobuf\FieldMask;

/**
 * @param string $projectId Your project ID
 * @param string $alertPolicyId Your alert policy id ID
 * @param array $channelIds array of channel IDs
 */
function alert_replace_channels($projectId, $alertPolicyId, array $channelIds)
{
    $alertClient = new AlertPolicyServiceClient([
        'projectId' => $projectId,
    ]);

    $channelClient = new NotificationChannelServiceClient([
        'projectId' => $projectId,
    ]);
    $policy = new AlertPolicy();
    $policy->setName($alertClient->alertPolicyName($projectId, $alertPolicyId));

    $newChannels = [];
    foreach ($channelIds as $channelId) {
        $newChannels[] = $channelClient->notificationChannelName($projectId, $channelId);
    }
    $policy->setNotificationChannels($newChannels);
    $mask = new FieldMask();
    $mask->setPaths(['notification_channels']);
    $updatedPolicy = $alertClient->updateAlertPolicy($policy, [
        'updateMask' => $mask,
    ]);
    printf('Updated %s' . PHP_EOL, $updatedPolicy->getName());
}

Python

def replace_notification_channels(project_name, alert_policy_id, channel_ids):
    _, project_id = project_name.split('/')
    alert_client = monitoring_v3.AlertPolicyServiceClient()
    channel_client = monitoring_v3.NotificationChannelServiceClient()
    policy = monitoring_v3.types.alert_pb2.AlertPolicy()
    policy.name = alert_client.alert_policy_path(project_id, alert_policy_id)

    for channel_id in channel_ids:
        policy.notification_channels.append(
            channel_client.notification_channel_path(project_id, channel_id))

    mask = monitoring_v3.types.field_mask_pb2.FieldMask()
    mask.paths.append('notification_channels')
    updated_policy = alert_client.update_alert_policy(policy, mask)
    print('Updated', updated_policy.name)

修改政策中的文档

政策中可以包括与政策关联的事件和通知中附带的文档。使用此字段添加信息,以协助响应人员理解和处理提醒政策所指示的问题。某些类型的通知允许附带文档发送,例如电子邮件通知;而另一些类型的渠道可能会省略文档。

GCLOUD 命令

要为政策添加文档或替换现有文档,请使用 gcloud alpha monitoring policies update 命令并提供 --documentation-format="text/markdown" 标志(唯一支持的格式),以及 --documentation 标志(从命令行输入值)或 --documentation-from-file 标志(从文件中读取值)。

例如,在项目 a-gcp-project 中创建显示名为 High CPU rate of change 的政策时,没有为该政策添加文档。

以下命令将指定政策中的 documentation 字段设置为 cpu-usage-doc.md 文件中的内容:

gcloud alpha monitoring policies update projects/a-gcp-project/alertPolicies/12669073143329903307 \
--documentation-format="text/markdown" \
--documentation-from-file="cpu-usage-doc.md"

如需了解详情,请参阅 gcloud alpha monitoring policies update 参考。update 命令与 REST API 中的 alertPolicies.patch 方法相对应。

示例:备份和恢复

此处显示的所有 API 示例都是从一个较大的应用中提取的,该应用可以将项目中的提醒政策备份到文件,并可以恢复政策(可能是恢复到另一个项目)。如果用于备份和恢复的项目不是同一个,该应用可以有效地将政策从一个项目导出并导入到另一个项目。

本部分提供的备份和恢复代码附有上下文,而非只摘录一小部分孤立的代码段。

备份政策

备份操作非常简单直接:收集每个项目中的提醒政策和通知渠道,以 JSON 格式保存到外部存储空间。

C#

        static void BackupPolicies(string projectId, string filePath)
        {
            var policyClient = AlertPolicyServiceClient.Create();
            var channelClient = NotificationChannelServiceClient.Create();
            var projectName = new ProjectName(projectId);
            File.WriteAllText(filePath, JsonConvert.SerializeObject(
                new BackupRecord()
                {
                    ProjectId = projectId,
                    Policies = policyClient.ListAlertPolicies(projectName),
                    Channels = channelClient.ListNotificationChannels(projectName)
                }, new ProtoMessageConverter()));
        }
        class BackupRecord
        {
            public string ProjectId { get; set; }
            public IEnumerable<AlertPolicy> Policies { get; set; }
            public IEnumerable<NotificationChannel> Channels { get; set; }
        }

        /// <summary>
        /// Lets Newtonsoft.Json and Protobuf's json converters play nicely
        /// together.  The default Netwtonsoft.Json Deserialize method will
        /// not correctly deserialize proto messages.
        /// </summary>
        class ProtoMessageConverter : JsonConverter
        {
            public override bool CanConvert(System.Type objectType)
            {
                return typeof(Google.Protobuf.IMessage)
                    .IsAssignableFrom(objectType);
            }

            public override object ReadJson(JsonReader reader,
                System.Type objectType, object existingValue,
                JsonSerializer serializer)
            {
                // Read an entire object from the reader.
                var converter = new ExpandoObjectConverter();
                object o = converter.ReadJson(reader, objectType, existingValue,
                    serializer);
                // Convert it back to json text.
                string text = JsonConvert.SerializeObject(o);
                // And let protobuf's parser parse the text.
                IMessage message = (IMessage)Activator
                    .CreateInstance(objectType);
                return Google.Protobuf.JsonParser.Default.Parse(text,
                    message.Descriptor);
            }

            public override void WriteJson(JsonWriter writer, object value,
                JsonSerializer serializer)
            {
                writer.WriteRawValue(Google.Protobuf.JsonFormatter.Default
                    .Format((IMessage)value));
            }
        }

Go

// backupPolicies writes a JSON representation of the project's alert
// policies and notification channels.
func backupPolicies(w io.Writer, projectID string) error {
	b := backup{ProjectID: projectID}
	ctx := context.Background()

	alertClient, err := monitoring.NewAlertPolicyClient(ctx)
	if err != nil {
		return err
	}
	alertReq := &monitoringpb.ListAlertPoliciesRequest{
		Name: "projects/" + projectID,
		// Filter:  "", // See https://cloud.google.com/monitoring/api/v3/sorting-and-filtering.
		// OrderBy: "", // See https://cloud.google.com/monitoring/api/v3/sorting-and-filtering.
	}
	alertIt := alertClient.ListAlertPolicies(ctx, alertReq)
	for {
		resp, err := alertIt.Next()
		if err == iterator.Done {
			break
		}
		if err != nil {
			return err
		}
		b.AlertPolicies = append(b.AlertPolicies, &alertPolicy{resp})
	}

	channelClient, err := monitoring.NewNotificationChannelClient(ctx)
	if err != nil {
		return err
	}
	channelReq := &monitoringpb.ListNotificationChannelsRequest{
		Name: "projects/" + projectID,
		// Filter:  "", // See https://cloud.google.com/monitoring/api/v3/sorting-and-filtering.
		// OrderBy: "", // See https://cloud.google.com/monitoring/api/v3/sorting-and-filtering.
	}
	channelIt := channelClient.ListNotificationChannels(ctx, channelReq)
	for {
		resp, err := channelIt.Next()
		if err == iterator.Done {
			break
		}
		if err != nil {
			return err
		}
		b.Channels = append(b.Channels, &channel{resp})
	}
	bs, err := json.MarshalIndent(b, "", "  ")
	if err != nil {
		return err
	}
	if _, err := w.Write(bs); err != nil {
		return err
	}
	return nil
}

// alertPolicy is a wrapper around the AlertPolicy proto to
// ensure JSON marshaling/unmarshaling works correctly.
type alertPolicy struct {
	*monitoringpb.AlertPolicy
}

// channel is a wrapper around the NotificationChannel proto to
// ensure JSON marshaling/unmarshaling works correctly.
type channel struct {
	*monitoringpb.NotificationChannel
}

// backup is used to backup and restore a project's policies.
type backup struct {
	ProjectID     string
	AlertPolicies []*alertPolicy
	Channels      []*channel
}

func (a *alertPolicy) MarshalJSON() ([]byte, error) {
	m := &jsonpb.Marshaler{EmitDefaults: true}
	b := new(bytes.Buffer)
	m.Marshal(b, a.AlertPolicy)
	return b.Bytes(), nil
}

func (a *alertPolicy) UnmarshalJSON(b []byte) error {
	u := &jsonpb.Unmarshaler{}
	a.AlertPolicy = new(monitoringpb.AlertPolicy)
	return u.Unmarshal(bytes.NewReader(b), a.AlertPolicy)
}

func (c *channel) MarshalJSON() ([]byte, error) {
	m := &jsonpb.Marshaler{}
	b := new(bytes.Buffer)
	m.Marshal(b, c.NotificationChannel)
	return b.Bytes(), nil
}

func (c *channel) UnmarshalJSON(b []byte) error {
	u := &jsonpb.Unmarshaler{}
	c.NotificationChannel = new(monitoringpb.NotificationChannel)
	return u.Unmarshal(bytes.NewReader(b), c.NotificationChannel)
}

Java

private static void backupPolicies(String projectId, String filePath) throws IOException {
  List<AlertPolicy> alertPolicies = getAlertPolicies(projectId);
  List<NotificationChannel> notificationChannels = getNotificationChannels(projectId);
  writePoliciesBackupFile(projectId, filePath, alertPolicies, notificationChannels);
  System.out.println(String.format("Saved policies to %s", filePath));
}

private static List<AlertPolicy> getAlertPolicies(String projectId) throws IOException {
  List<AlertPolicy> alertPolicies = Lists.newArrayList();
  try (AlertPolicyServiceClient client = AlertPolicyServiceClient.create()) {
    ListAlertPoliciesPagedResponse response = client.listAlertPolicies(ProjectName.of(projectId));

    for (AlertPolicy policy : response.iterateAll()) {
      alertPolicies.add(policy);
    }
  }
  return alertPolicies;
}

private static List<NotificationChannel> getNotificationChannels(String projectId)
    throws IOException {
  List<NotificationChannel> notificationChannels = Lists.newArrayList();
  try (NotificationChannelServiceClient client = NotificationChannelServiceClient.create()) {
    ListNotificationChannelsPagedResponse listNotificationChannelsResponse =
        client.listNotificationChannels(ProjectName.of(projectId));
    for (NotificationChannel channel : listNotificationChannelsResponse.iterateAll()) {
      notificationChannels.add(channel);
    }
  }
  return notificationChannels;
}

private static void writePoliciesBackupFile(
    String projectId,
    String filePath,
    List<AlertPolicy> alertPolicies,
    List<NotificationChannel> notificationChannels) throws IOException {
  JsonObject backupContents = new JsonObject();
  backupContents.add("project_id", new JsonPrimitive(projectId));
  JsonArray policiesJson = new JsonArray();
  for (AlertPolicy policy : alertPolicies) {
    policiesJson.add(gson.toJsonTree(policy));
  }
  backupContents.add("policies", policiesJson);

  JsonArray notificationsJson = new JsonArray();
  for (NotificationChannel channel : notificationChannels) {
    notificationsJson.add(gson.toJsonTree(channel));
  }
  backupContents.add("notification_channels", notificationsJson);

  FileWriter writer = new FileWriter(filePath);
  writer.write(backupContents.toString());
  writer.close();
}

Node.js

const fs = require('fs');

// Imports the Google Cloud client library
const monitoring = require('@google-cloud/monitoring');

// Creates a client
const client = new monitoring.AlertPolicyServiceClient();

/**
 * TODO(developer): Uncomment the following lines before running the sample.
 */
// const projectId = 'YOUR_PROJECT_ID';

const listAlertPoliciesRequest = {
  name: client.projectPath(projectId),
};

let [policies] = await client.listAlertPolicies(listAlertPoliciesRequest);

// filter out any policies created by tests for this sample
policies = policies.filter(policy => {
  return !policy.displayName.startsWith('gcloud-tests-');
});

fs.writeFileSync(
  './policies_backup.json',
  JSON.stringify(policies, null, 2),
  'utf-8'
);

console.log('Saved policies to ./policies_backup.json');

PHP

use Google\Cloud\Monitoring\V3\AlertPolicyServiceClient;
use Google\Cloud\Monitoring\V3\NotificationChannelServiceClient;

/**
 * Back up alert policies.
 *
 * @param string $projectId Your project ID
 */
function alert_backup_policies($projectId)
{
    $alertClient = new AlertPolicyServiceClient([
        'projectId' => $projectId,
    ]);
    $channelClient = new NotificationChannelServiceClient([
        'projectId' => $projectId,
    ]);
    $projectName = $alertClient->projectName($projectId);

    $record = [
        'project_name' => $projectName,
        'policies' => [],
        'channels' => [],
    ];
    $policies = $alertClient->listAlertPolicies($projectName);
    foreach ($policies->iterateAllElements() as $policy) {
        $record['policies'][] = json_decode($policy->serializeToJsonString());
    }
    $channels = $channelClient->listNotificationChannels($projectName);
    foreach ($channels->iterateAllElements() as $channel) {
        $record['channels'][] = json_decode($channel->serializeToJsonString());
    }
    file_put_contents('backup.json', json_encode($record, JSON_PRETTY_PRINT));
    print('Backed up alert policies and notification channels to backup.json.');
}

Python

def backup(project_name):
    alert_client = monitoring_v3.AlertPolicyServiceClient()
    channel_client = monitoring_v3.NotificationChannelServiceClient()
    record = {'project_name': project_name,
              'policies': list(alert_client.list_alert_policies(project_name)),
              'channels': list(channel_client.list_notification_channels(
                  project_name))}
    json.dump(record, open('backup.json', 'wt'), cls=ProtoEncoder, indent=2)
    print('Backed up alert policies and notification channels to backup.json.')

class ProtoEncoder(json.JSONEncoder):
    """Uses google.protobuf.json_format to encode protobufs as json."""
    def default(self, obj):
        if type(obj) in (monitoring_v3.types.alert_pb2.AlertPolicy,
                         monitoring_v3.types.notification_pb2.
                         NotificationChannel):
            text = google.protobuf.json_format.MessageToJson(obj)
            return json.loads(text)
        return super(ProtoEncoder, self).default(obj)

恢复已备份的政策

恢复过程比原始备份复杂。您可以恢复到最初备份的项目;也可以恢复到其他项目,即提供提醒政策的导入。

如果恢复到同一项目,并且该项目中仍存在备份中的政策或渠道,则这些政策或渠道将全部更新。如果现有项目中已不存在备份中的政策或渠道,则备份将在现有项目中重新创建这些政策或渠道。在重新创建策略和通知之前,还原过程将清除备份政策中的只读字段,如创建和突变记录。

您可以使用保存在一个项目中的政策,在另一个项目中创建新政策或类似政策。但是,您必须首先在已保存政策的副本中进行以下更改:

  • 从任何通知渠道中移除以下字段:
    • name
    • verificationStatus
  • 在引用提醒政策中的通知渠道之前先创建通知渠道(您需要新的渠道标识符)。
  • 从您正在重新创建的任何提醒政策中移除以下字段:
    • name
    • condition.name
    • creationRecord
    • mutationRecord

如果在新项目中重新创建政策,则备份政策中任何条件的名称以及创建和突变记录也会一并清除。

此外,在另一个项目中重新创建通知渠道时,该渠道将被赋予不同的名称,因此恢复过程必须将已备份提醒政策中的渠道名称映射到新名称,并用新名称替换旧名称。

除了通知渠道的名称之外,verificationStatus 字段的值无法在创建或更新渠道时设置,因此会使用一个特殊值,即 unspecified。渠道恢复到新项目后,必须明确对其进行验证。

C#

        static void RestorePolicies(string projectId, string filePath)
        {
            var policyClient = AlertPolicyServiceClient.Create();
            var channelClient = NotificationChannelServiceClient.Create();
            List<Exception> exceptions = new List<Exception>();
            var backup = JsonConvert.DeserializeObject<BackupRecord>(
                File.ReadAllText(filePath), new ProtoMessageConverter());
            var projectName = new ProjectName(projectId);
            bool isSameProject = projectId == backup.ProjectId;
            // When a channel is recreated, rather than updated, it will get
            // a new name.  We have to update the AlertPolicy with the new
            // name.  Track the names in this map.
            var channelNameMap = new Dictionary<string, string>();
            foreach (NotificationChannel channel in backup.Channels)
            {
                try
                {
                    bool updated = false;
                    Console.WriteLine("Updating channel.\n{0}",
                        channel.DisplayName);
                    // This field is immutable and it is illegal to specify a
                    // non-default value (UNVERIFIED or VERIFIED) in the
                    // Create() or Update() operations.
                    channel.VerificationStatus = NotificationChannel.Types
                        .VerificationStatus.Unspecified;
                    if (isSameProject)
                        try
                        {
                            channelClient.UpdateNotificationChannel(
                                null, channel);
                            updated = true;
                        }
                        catch (Grpc.Core.RpcException e)
                        when (e.Status.StatusCode == StatusCode.NotFound)
                        { }
                    if (!updated)
                    {
                        // The channel no longer exists.  Recreate it.
                        string oldName = channel.Name;
                        channel.Name = null;
                        var response = channelClient.CreateNotificationChannel(
                            projectName, channel);
                        channelNameMap.Add(oldName, response.Name);
                    }
                }
                catch (Exception e)
                {
                    // If one failed, continue trying to update the others.
                    exceptions.Add(e);
                }
            }
            foreach (AlertPolicy policy in backup.Policies)
            {
                string policyName = policy.Name;
                // These two fields cannot be set directly, so clear them.
                policy.CreationRecord = null;
                policy.MutationRecord = null;
                // Update channel names if the channel was recreated with
                // another name.
                for (int i = 0; i < policy.NotificationChannels.Count; ++i)
                {
                    if (channelNameMap.ContainsKey(policy.NotificationChannels[i]))
                    {
                        policy.NotificationChannels[i] =
                            channelNameMap[policy.NotificationChannels[i]];
                    }
                }
                try
                {
                    Console.WriteLine("Updating policy.\n{0}",
                        policy.DisplayName);
                    bool updated = false;
                    if (isSameProject)
                        try
                        {
                            policyClient.UpdateAlertPolicy(null, policy);
                            updated = true;
                        }
                        catch (Grpc.Core.RpcException e)
                        when (e.Status.StatusCode == StatusCode.NotFound)
                        { }
                    if (!updated)
                    {
                        // The policy no longer exists.  Recreate it.
                        policy.Name = null;
                        foreach (var condition in policy.Conditions)
                        {
                            condition.Name = null;
                        }
                        policyClient.CreateAlertPolicy(projectName, policy);
                    }
                    Console.WriteLine("Restored {0}.", policyName);
                }
                catch (Exception e)
                {
                    // If one failed, continue trying to update the others.
                    exceptions.Add(e);
                }
            }
            if (exceptions.Count > 0)
            {
                throw new AggregateException(exceptions);
            }
        }

        class BackupRecord
        {
            public string ProjectId { get; set; }
            public IEnumerable<AlertPolicy> Policies { get; set; }
            public IEnumerable<NotificationChannel> Channels { get; set; }
        }

        /// <summary>
        /// Lets Newtonsoft.Json and Protobuf's json converters play nicely
        /// together.  The default Netwtonsoft.Json Deserialize method will
        /// not correctly deserialize proto messages.
        /// </summary>
        class ProtoMessageConverter : JsonConverter
        {
            public override bool CanConvert(System.Type objectType)
            {
                return typeof(Google.Protobuf.IMessage)
                    .IsAssignableFrom(objectType);
            }

            public override object ReadJson(JsonReader reader,
                System.Type objectType, object existingValue,
                JsonSerializer serializer)
            {
                // Read an entire object from the reader.
                var converter = new ExpandoObjectConverter();
                object o = converter.ReadJson(reader, objectType, existingValue,
                    serializer);
                // Convert it back to json text.
                string text = JsonConvert.SerializeObject(o);
                // And let protobuf's parser parse the text.
                IMessage message = (IMessage)Activator
                    .CreateInstance(objectType);
                return Google.Protobuf.JsonParser.Default.Parse(text,
                    message.Descriptor);
            }

            public override void WriteJson(JsonWriter writer, object value,
                JsonSerializer serializer)
            {
                writer.WriteRawValue(Google.Protobuf.JsonFormatter.Default
                    .Format((IMessage)value));
            }
        }

Go

// restorePolicies updates the project with the alert policies and
// notification channels in r.
func restorePolicies(w io.Writer, projectID string, r io.Reader) error {
	b := backup{}
	if err := json.NewDecoder(r).Decode(&b); err != nil {
		return err
	}
	sameProject := projectID == b.ProjectID

	ctx := context.Background()

	alertClient, err := monitoring.NewAlertPolicyClient(ctx)
	if err != nil {
		return err
	}
	channelClient, err := monitoring.NewNotificationChannelClient(ctx)
	if err != nil {
		return err
	}

	// When a channel is recreated, rather than updated, it will get
	// a new name.  We have to update the AlertPolicy with the new
	// name.  channelNames keeps track of the new names.
	channelNames := make(map[string]string)
	for _, c := range b.Channels {
		fmt.Fprintf(w, "Updating channel %q\n", c.GetDisplayName())
		c.VerificationStatus = monitoringpb.NotificationChannel_VERIFICATION_STATUS_UNSPECIFIED
		updated := false
		if sameProject {
			req := &monitoringpb.UpdateNotificationChannelRequest{
				NotificationChannel: c.NotificationChannel,
			}
			_, err := channelClient.UpdateNotificationChannel(ctx, req)
			if err == nil {
				updated = true
			}
		}
		if !updated {
			req := &monitoringpb.CreateNotificationChannelRequest{
				Name:                "projects/" + projectID,
				NotificationChannel: c.NotificationChannel,
			}
			oldName := c.GetName()
			c.Name = ""
			newC, err := channelClient.CreateNotificationChannel(ctx, req)
			if err != nil {
				return err
			}
			channelNames[oldName] = newC.GetName()
		}
	}

	for _, policy := range b.AlertPolicies {
		fmt.Fprintf(w, "Updating alert %q\n", policy.GetDisplayName())
		policy.CreationRecord = nil
		policy.MutationRecord = nil
		for i, aChannel := range policy.GetNotificationChannels() {
			if c, ok := channelNames[aChannel]; ok {
				policy.NotificationChannels[i] = c
			}
		}
		updated := false
		if sameProject {
			req := &monitoringpb.UpdateAlertPolicyRequest{
				AlertPolicy: policy.AlertPolicy,
			}
			_, err := alertClient.UpdateAlertPolicy(ctx, req)
			if err == nil {
				updated = true
			}
		}
		if !updated {
			req := &monitoringpb.CreateAlertPolicyRequest{
				Name:        "projects/" + projectID,
				AlertPolicy: policy.AlertPolicy,
			}
			if _, err = alertClient.CreateAlertPolicy(ctx, req); err != nil {
				log.Fatal(err)
			}
		}
	}
	fmt.Fprintf(w, "Successfully restored alerts.")
	return nil
}

Java

private static void restorePolicies(String projectId, String filePath) throws IOException {
  FileReader reader = new FileReader(filePath);
  BufferedReader bufferedReader = new BufferedReader(reader);

  JsonObject backupContent = getPolicyJsonContents(filePath, bufferedReader);
  String backupProjectId = backupContent.get("project_id").getAsString();
  boolean isSameProject = projectId.equals(backupProjectId);

  AlertPolicy[] policies = gson.fromJson(backupContent.get("policies"), AlertPolicy[].class);
  List<NotificationChannel> notificationChannels = readNotificationChannelsJson(backupContent);
  Map<String, String> restoredChannelIds = restoreNotificationChannels(projectId,
      notificationChannels,
      isSameProject);
  List<AlertPolicy> policiesToRestore =
      reviseRestoredPolicies(policies, isSameProject, restoredChannelIds);

  restoreRevisedPolicies(projectId, isSameProject, policiesToRestore);
}

private static List<AlertPolicy> reviseRestoredPolicies(
    AlertPolicy[] policies,
    boolean isSameProject,
    Map<String, String> restoredChannelIds) {
  List<AlertPolicy> newPolicies = Lists.newArrayListWithCapacity(policies.length);
  for (AlertPolicy policy : policies) {
    AlertPolicy.Builder policyBuilder = policy
        .toBuilder()
        .clearNotificationChannels()
        .clearMutationRecord()
        .clearCreationRecord();
    // Update restored notification channel names.
    for (String channelName : policy.getNotificationChannelsList()) {
      String newChannelName = restoredChannelIds.get(channelName);
      if (!Strings.isNullOrEmpty(newChannelName)) {
        policyBuilder.addNotificationChannels(newChannelName);
      }
    }
    if (!isSameProject) {
      policyBuilder.clearName();
      policyBuilder.clearConditions();
      for (AlertPolicy.Condition condition : policy.getConditionsList()) {
        policyBuilder.addConditions(condition.toBuilder().clearName());
      }
    }
    newPolicies.add(policyBuilder.build());
  }
  return newPolicies;
}

private static void restoreRevisedPolicies(
    String projectId,
    boolean isSameProject,
    List<AlertPolicy> policies) throws IOException {
  try (AlertPolicyServiceClient client = AlertPolicyServiceClient.create()) {
    for (AlertPolicy policy : policies) {
      if (!isSameProject) {
        policy = client.createAlertPolicy(ProjectName.of(projectId), policy);
      } else {
        try {
          client.updateAlertPolicy(null, policy);
        } catch (Exception e) {
          policy = client.createAlertPolicy(
              ProjectName.of(projectId),
              policy.toBuilder().clearName().build());
        }
      }
      System.out.println(String.format("Restored %s", policy.getName()));
    }
  }
}

private static List<NotificationChannel> readNotificationChannelsJson(JsonObject backupContent) {
  if (backupContent.has("notification_channels")) {
    NotificationChannel[] channels = gson.fromJson(backupContent.get("notification_channels"),
        NotificationChannel[].class);
    return Lists.newArrayList(channels);
  }
  return Lists.newArrayList();
}

private static Map<String, String> restoreNotificationChannels(
    String projectId,
    List<NotificationChannel> channels,
    boolean isSameProject) throws IOException {
  Map<String, String> newChannelNames = Maps.newHashMap();
  try (NotificationChannelServiceClient client = NotificationChannelServiceClient.create()) {
    for (NotificationChannel channel : channels) {
      // Update channel name if project ID is different.
      boolean channelUpdated = false;
      if (isSameProject) {
        try {
          NotificationChannel updatedChannel =
              client.updateNotificationChannel(NOTIFICATION_CHANNEL_UPDATE_MASK, channel);
          newChannelNames.put(channel.getName(), updatedChannel.getName());
          channelUpdated = true;
        } catch (Exception e) {
          channelUpdated = false;
        }
      }
      if (!channelUpdated) {
        NotificationChannel newChannel = client.createNotificationChannel(
            ProjectName.of(projectId),
            channel
                .toBuilder()
                .clearName()
                .clearVerificationStatus()
                .build());
        newChannelNames.put(channel.getName(), newChannel.getName());
      }
    }
  }
  return newChannelNames;
}

private static JsonObject getPolicyJsonContents(String filePath, BufferedReader content) {
  try {
    return gson.fromJson(content, JsonObject.class);
  } catch (JsonSyntaxException jse) {
    throw new RuntimeException(String.format("Could not parse policies file %s", filePath), jse);
  }
}

Node.js

const fs = require('fs');

// Imports the Google Cloud client library
const monitoring = require('@google-cloud/monitoring');

// Creates a client
const client = new monitoring.AlertPolicyServiceClient();

/**
 * TODO(developer): Uncomment the following lines before running the sample.
 */
// const projectId = 'YOUR_PROJECT_ID';

console.log('Loading policies from ./policies_backup.json');
const fileContent = fs.readFileSync('./policies_backup.json', 'utf-8');
const policies = JSON.parse(fileContent);

for (const index in policies) {
  // Restore each policy one at a time
  let policy = policies[index];
  if (await doesAlertPolicyExist(policy.name)) {
    policy = await client.updateAlertPolicy({alertPolicy: policy});
  } else {
    // Clear away output-only fields
    delete policy.name;
    delete policy.creationRecord;
    delete policy.mutationRecord;
    policy.conditions.forEach(condition => delete condition.name);

    policy = await client.createAlertPolicy({
      name: client.projectPath(projectId),
      alertPolicy: policy,
    });
  }

  console.log(`Restored ${policy[0].name}.`);
}
async function doesAlertPolicyExist(name) {
  try {
    const [policy] = await client.getAlertPolicy({name});
    return policy ? true : false;
  } catch (err) {
    if (err && err.code === 5) {
      // Error code 5 comes from the google.rpc.code.NOT_FOUND protobuf
      return false;
    }
    throw err;
  }
}

PHP

use Google\Cloud\Monitoring\V3\AlertPolicyServiceClient;
use Google\Cloud\Monitoring\V3\NotificationChannelServiceClient;
use Google\Cloud\Monitoring\V3\AlertPolicy;
use Google\Cloud\Monitoring\V3\NotificationChannel;
use Google\Cloud\Monitoring\V3\NotificationChannel\VerificationStatus;
use Google\ApiCore\ApiException;

/**
 * @param string $projectId Your project ID
 */
function alert_restore_policies($projectId)
{
    $alertClient = new AlertPolicyServiceClient([
        'projectId' => $projectId,
    ]);

    $channelClient = new NotificationChannelServiceClient([
        'projectId' => $projectId,
    ]);

    print('Loading alert policies and notification channels from backup.json.' . PHP_EOL);
    $projectName = $alertClient->projectName($projectId);
    $record = json_decode(file_get_contents('backup.json'), true);
    $isSameProject = $projectName == $record['project_name'];

    # Convert dicts to AlertPolicies.
    $policies = [];
    foreach ($record['policies'] as $policyArray) {
        $policy = new AlertPolicy();
        $policy->mergeFromJsonString(json_encode($policyArray));
        $policies[] = $policy;
    }

    # Convert dicts to NotificationChannels
    $channels = [];
    foreach (array_filter($record['channels']) as $channelArray) {
        $channel = new NotificationChannel();
        $channel->mergeFromJsonString(json_encode($channelArray));
        $channels[] = $channel;
    }

    # Restore the channels.
    $channelNameMap = [];
    foreach ($channels as $channel) {
        $updated = false;
        printf('Updating channel %s' . PHP_EOL, $channel->getDisplayName());

        # This field is immutable and it is illegal to specify a
        # non-default value (UNVERIFIED or VERIFIED) in the
        # Create() or Update() operations.
        $channel->setVerificationStatus(
            VerificationStatus::VERIFICATION_STATUS_UNSPECIFIED
        );

        if ($isSameProject) {
            try {
                $channelClient->updateNotificationChannel($channel);
                $updated = true;
            } catch (ApiException $e) {
                # The channel was deleted.  Create it below.
                if ($e->getStatus() !== 'NOT_FOUND') {
                    throw $e;
                }
            }
        }

        if (!$updated) {
            # The channel no longer exists.  Recreate it.
            $oldName = $channel->getName();
            $channel->setName('');
            $newChannel = $channelClient->createNotificationChannel(
                $projectName,
                $channel
            );
            $channelNameMap[$oldName] = $newChannel->getName();
        }
    }

    # Restore the alerts
    foreach ($policies as $policy) {
        printf('Updating policy %s' . PHP_EOL, $policy->getDisplayName());
        # These two fields cannot be set directly, so clear them.
        $policy->setCreationRecord(null);
        $policy->setMutationRecord(null);

        $notificationChannels = $policy->getNotificationChannels();

        # Update old channel names with new channel names.
        foreach ($notificationChannels as $i => $channel) {
            if (isset($channelNameMap[$channel])) {
                $notificationChannels[$i] = $channelNameMap[$channel];
            }
        }

        $updated = false;
        if ($isSameProject) {
            try {
                $alertClient->updateAlertPolicy($policy);
                $updated = true;
            } catch (ApiException $e) {
                # The policy was deleted.  Create it below.
                if ($e->getStatus() !== 'NOT_FOUND') {
                    throw $e;
                }
            }
        }

        if (!$updated) {
            # The policy no longer exists.  Recreate it.
            $oldName = $policy->getName();
            $policy->setName('');
            foreach ($policy->getConditions() as $condition) {
                $condition->setName('');
            }
            $policy = $alertClient->createAlertPolicy($projectName, $policy);
        }
        printf('Updated %s' . PHP_EOL, $policy->getName());
    }
    print('Restored alert policies and notification channels from backup.json.');
}

Python

def restore(project_name):
    print('Loading alert policies and notification channels from backup.json.')
    record = json.load(open('backup.json', 'rt'))
    is_same_project = project_name == record['project_name']
    # Convert dicts to AlertPolicies.
    policies_json = [json.dumps(policy) for policy in record['policies']]
    policies = [google.protobuf.json_format.Parse(
        policy_json, monitoring_v3.types.alert_pb2.AlertPolicy())
        for policy_json in policies_json]
    # Convert dicts to NotificationChannels
    channels_json = [json.dumps(channel) for channel in record['channels']]
    channels = [google.protobuf.json_format.Parse(
        channel_json, monitoring_v3.types.notification_pb2.
        NotificationChannel()) for channel_json in channels_json]

    # Restore the channels.
    channel_client = monitoring_v3.NotificationChannelServiceClient()
    channel_name_map = {}

    for channel in channels:
        updated = False
        print('Updating channel', channel.display_name)
        # This field is immutable and it is illegal to specify a
        # non-default value (UNVERIFIED or VERIFIED) in the
        # Create() or Update() operations.
        channel.verification_status = monitoring_v3.enums.NotificationChannel.\
            VerificationStatus.VERIFICATION_STATUS_UNSPECIFIED

        if is_same_project:
            try:
                channel_client.update_notification_channel(channel)
                updated = True
            except google.api_core.exceptions.NotFound:
                pass  # The channel was deleted.  Create it below.

        if not updated:
            # The channel no longer exists.  Recreate it.
            old_name = channel.name
            channel.ClearField("name")
            new_channel = channel_client.create_notification_channel(
                project_name, channel)
            channel_name_map[old_name] = new_channel.name

    # Restore the alerts
    alert_client = monitoring_v3.AlertPolicyServiceClient()

    for policy in policies:
        print('Updating policy', policy.display_name)
        # These two fields cannot be set directly, so clear them.
        policy.ClearField('creation_record')
        policy.ClearField('mutation_record')

        # Update old channel names with new channel names.
        for i, channel in enumerate(policy.notification_channels):
            new_channel = channel_name_map.get(channel)
            if new_channel:
                policy.notification_channels[i] = new_channel

        updated = False

        if is_same_project:
            try:
                alert_client.update_alert_policy(policy)
                updated = True
            except google.api_core.exceptions.NotFound:
                pass  # The policy was deleted.  Create it below.
            except google.api_core.exceptions.InvalidArgument:
                # Annoying that API throws InvalidArgument when the policy
                # does not exist.  Seems like it should throw NotFound.
                pass  # The policy was deleted.  Create it below.

        if not updated:
            # The policy no longer exists.  Recreate it.
            old_name = policy.name
            policy.ClearField("name")
            for condition in policy.conditions:
                condition.ClearField("name")
            policy = alert_client.create_alert_policy(project_name, policy)
        print('Updated', policy.name)

提醒和 Cloud SDK

在 Cloud SDK 中,用于管理提醒政策和通知渠道的命令组是 monitoring(现为 Alpha 版)。monitoring 组在 alpha 组件中提供。也就是说,这些命令均以如下内容开头:

gcloud alpha monitoring

要检查您是否安装了 alpha 组件,请运行以下命令:

gcloud components list

如果您没有安装 alpha 组件,请运行以下命令进行安装:

gcloud components install alpha

如果您已安装了 alpha 组件,请通过运行以下命令来检查是否包含 monitoring 组:

gcloud alpha monitoring --help

如果未包含 monitoring 组,Cloud SDK 将提示您进行添加:

You do not currently have this command group installed.
[...]
Do you want to continue (Y/n)?  y
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