REST Resource: projects.alertPolicies

Resource: AlertPolicy

A description of the conditions under which some aspect of your system is considered to be "unhealthy" and the ways to notify people or services about this state. For an overview of alerting policies, see Introduction to Alerting.

JSON representation 
{
  "name": string,
  "displayName": string,
  "documentation": {
    object (Documentation)
  },
  "userLabels": {
    string: string,
    ...
  },
  "conditions": [
    {
      object (Condition)
    }
  ],
  "combiner": enum (ConditionCombinerType),
  "enabled": boolean,
  "validity": {
    object (Status)
  },
  "notificationChannels": [
    string
  ],
  "creationRecord": {
    object (MutationRecord)
  },
  "mutationRecord": {
    object (MutationRecord)
  },
  "alertStrategy": {
    object (AlertStrategy)
  },
  "severity": enum (Severity)
}
Fields
name

string

Identifier. Required if the policy exists. The resource name for this policy. The format is:

projects/[PROJECT_ID_OR_NUMBER]/alertPolicies/[ALERT_POLICY_ID]

[ALERT_POLICY_ID] is assigned by Cloud Monitoring when the policy is created. When calling the alertPolicies.create method, do not include the name field in the alerting policy passed as part of the request.
displayName

string

A short name or phrase used to identify the policy in dashboards, notifications, and incidents. To avoid confusion, don't use the same display name for multiple policies in the same project. The name is limited to 512 Unicode characters.

The convention for the displayName of a PrometheusQueryLanguageCondition is "{rule group name}/{alert name}", where the {rule group name} and {alert name} should be taken from the corresponding Prometheus configuration file. This convention is not enforced. In any case the displayName is not a unique key of the AlertPolicy.
documentation

object (Documentation)

Documentation that is included with notifications and incidents related to this policy. Best practice is for the documentation to include information to help responders understand, mitigate, escalate, and correct the underlying problems detected by the alerting policy. Notification channels that have limited capacity might not show this documentation.
userLabels

map (key: string, value: string)

User-supplied key/value data to be used for organizing and identifying the AlertPolicy objects.

The field can contain up to 64 entries. Each key and value is limited to 63 Unicode characters or 128 bytes, whichever is smaller. Labels and values can contain only lowercase letters, numerals, underscores, and dashes. Keys must begin with a letter.

Note that Prometheus {alert name} is a valid Prometheus label names, whereas Prometheus {rule group} is an unrestricted UTF-8 string. This means that they cannot be stored as-is in user labels, because they may contain characters that are not allowed in user-label values.
conditions[]

object (Condition)

A list of conditions for the policy. The conditions are combined by AND or OR according to the combiner field. If the combined conditions evaluate to true, then an incident is created. A policy can have from one to six conditions. If conditionTimeSeriesQueryLanguage is present, it must be the only condition. If conditionMonitoringQueryLanguage is present, it must be the only condition.
combiner

enum (ConditionCombinerType)

How to combine the results of multiple conditions to determine if an incident should be opened. If conditionTimeSeriesQueryLanguage is present, this must be COMBINE_UNSPECIFIED.
enabled

boolean

Whether or not the policy is enabled. On write, the default interpretation if unset is that the policy is enabled. On read, clients should not make any assumption about the state if it has not been populated. The field should always be populated on List and Get operations, unless a field projection has been specified that strips it out.
validity

object (Status)

Read-only description of how the alerting policy is invalid. This field is only set when the alerting policy is invalid. An invalid alerting policy will not generate incidents.
notificationChannels[]

string

Identifies the notification channels to which notifications should be sent when incidents are opened or closed or when new violations occur on an already opened incident. Each element of this array corresponds to the name field in each of the NotificationChannel objects that are returned from the notificationChannels.list method. The format of the entries in this field is:

projects/[PROJECT_ID_OR_NUMBER]/notificationChannels/[CHANNEL_ID]
creationRecord

object (MutationRecord)

A read-only record of the creation of the alerting policy. If provided in a call to create or update, this field will be ignored.
mutationRecord

object (MutationRecord)

A read-only record of the most recent change to the alerting policy. If provided in a call to create or update, this field will be ignored.
alertStrategy

object (AlertStrategy)

Control over how this alerting policy's notification channels are notified.
severity

enum (Severity)

Optional. The severity of an alerting policy indicates how important incidents generated by that policy are. The severity level will be displayed on the Incident detail page and in notifications.

Documentation

Documentation that is included in the notifications and incidents pertaining to this policy.

JSON representation 
{
  "content": string,
  "mimeType": string,
  "subject": string,
  "links": [
    {
      object (Link)
    }
  ]
}
Fields
content

string

The body of the documentation, interpreted according to mimeType. The content may not exceed 8,192 Unicode characters and may not exceed more than 10,240 bytes when encoded in UTF-8 format, whichever is smaller. This text can be templatized by using variables.
mimeType

string

The format of the content field. Presently, only the value "text/markdown" is supported. See Markdown for more information.
subject

string

Optional. The subject line of the notification. The subject line may not exceed 10,240 bytes. In notifications generated by this policy, the contents of the subject line after variable expansion will be truncated to 255 bytes or shorter at the latest UTF-8 character boundary. The 255-byte limit is recommended by this thread. It is both the limit imposed by some third-party ticketing products and it is common to define textual fields in databases as VARCHAR(255).

The contents of the subject line can be templatized by using variables. If this field is missing or empty, a default subject line will be generated.

Condition

A condition is a true/false test that determines when an alerting policy should open an incident. If a condition evaluates to true, it signifies that something is wrong.

JSON representation 
{
  "name": string,
  "displayName": string,

  // Union field condition can be only one of the following:
  "conditionThreshold": {
    object (MetricThreshold)
  },
  "conditionAbsent": {
    object (MetricAbsence)
  },
  "conditionMatchedLog": {
    object (LogMatch)
  },
  "conditionMonitoringQueryLanguage": {
    object (MonitoringQueryLanguageCondition)
  },
  "conditionPrometheusQueryLanguage": {
    object (PrometheusQueryLanguageCondition)
  },
  "conditionSql": {
    object (SqlCondition)
  }
  // End of list of possible types for union field condition.
}
Fields
name

string

Required if the condition exists. The unique resource name for this condition. Its format is:

projects/[PROJECT_ID_OR_NUMBER]/alertPolicies/[POLICY_ID]/conditions/[CONDITION_ID]

[CONDITION_ID] is assigned by Cloud Monitoring when the condition is created as part of a new or updated alerting policy.

When calling the alertPolicies.create method, do not include the name field in the conditions of the requested alerting policy. Cloud Monitoring creates the condition identifiers and includes them in the new policy.

When calling the alertPolicies.update method to update a policy, including a condition name causes the existing condition to be updated. Conditions without names are added to the updated policy. Existing conditions are deleted if they are not updated.

Best practice is to preserve [CONDITION_ID] if you make only small changes, such as those to condition thresholds, durations, or trigger values. Otherwise, treat the change as a new condition and let the existing condition be deleted.
displayName

string

A short name or phrase used to identify the condition in dashboards, notifications, and incidents. To avoid confusion, don't use the same display name for multiple conditions in the same policy.
Union field condition. Only one of the following condition types will be specified. condition can be only one of the following:
conditionThreshold

object (MetricThreshold)

A condition that compares a time series against a threshold.
conditionAbsent

object (MetricAbsence)

A condition that checks that a time series continues to receive new data points.
conditionMatchedLog

object (LogMatch)

A condition that checks for log messages matching given constraints. If set, no other conditions can be present.
conditionMonitoringQueryLanguage

object (MonitoringQueryLanguageCondition)

A condition that uses the Monitoring Query Language to define alerts.
conditionPrometheusQueryLanguage

object (PrometheusQueryLanguageCondition)

A condition that uses the Prometheus query language to define alerts.
conditionSql

object (SqlCondition)

A condition that periodically evaluates a SQL query result.

MetricThreshold

A condition type that compares a collection of time series against a threshold.

JSON representation 
{
  "filter": string,
  "aggregations": [
    {
      object (Aggregation)
    }
  ],
  "denominatorFilter": string,
  "denominatorAggregations": [
    {
      object (Aggregation)
    }
  ],
  "forecastOptions": {
    object (ForecastOptions)
  },
  "comparison": enum (ComparisonType),
  "thresholdValue": number,
  "duration": string,
  "trigger": {
    object (Trigger)
  },
  "evaluationMissingData": enum (EvaluationMissingData)
}
Fields
filter

string

Required. A filter that identifies which time series should be compared with the threshold.

The filter is similar to the one that is specified in the timeSeries.list request (that call is useful to verify the time series that will be retrieved / processed). The filter must specify the metric type and the resource type. Optionally, it can specify resource labels and metric labels. This field must not exceed 2048 Unicode characters in length.
aggregations[]

object (Aggregation)

Specifies the alignment of data points in individual time series as well as how to combine the retrieved time series together (such as when aggregating multiple streams on each resource to a single stream for each resource or when aggregating streams across all members of a group of resources). Multiple aggregations are applied in the order specified.

This field is similar to the one in the timeSeries.list request. It is advisable to use the timeSeries.list method when debugging this field.
denominatorFilter

string

A filter that identifies a time series that should be used as the denominator of a ratio that will be compared with the threshold. If a denominatorFilter is specified, the time series specified by the filter field will be used as the numerator.

The filter must specify the metric type and optionally may contain restrictions on resource type, resource labels, and metric labels. This field may not exceed 2048 Unicode characters in length.
denominatorAggregations[]

object (Aggregation)

Specifies the alignment of data points in individual time series selected by denominatorFilter as well as how to combine the retrieved time series together (such as when aggregating multiple streams on each resource to a single stream for each resource or when aggregating streams across all members of a group of resources).

When computing ratios, the aggregations and denominatorAggregations fields must use the same alignment period and produce time series that have the same periodicity and labels.
forecastOptions

object (ForecastOptions)

When this field is present, the MetricThreshold condition forecasts whether the time series is predicted to violate the threshold within the forecastHorizon. When this field is not set, the MetricThreshold tests the current value of the timeseries against the threshold.
comparison

enum (ComparisonType)

The comparison to apply between the time series (indicated by filter and aggregation) and the threshold (indicated by thresholdValue). The comparison is applied on each time series, with the time series on the left-hand side and the threshold on the right-hand side.

Only COMPARISON_LT and COMPARISON_GT are supported currently.
thresholdValue

number

A value against which to compare the time series.
duration

string (Duration format)

The amount of time that a time series must violate the threshold to be considered failing. Currently, only values that are a multiple of a minute--e.g., 0, 60, 120, or 300 seconds--are supported. If an invalid value is given, an error will be returned. When choosing a duration, it is useful to keep in mind the frequency of the underlying time series data (which may also be affected by any alignments specified in the aggregations field); a good duration is long enough so that a single outlier does not generate spurious alerts, but short enough that unhealthy states are detected and alerted on quickly.
trigger

object (Trigger)

The number/percent of time series for which the comparison must hold in order for the condition to trigger. If unspecified, then the condition will trigger if the comparison is true for any of the time series that have been identified by filter and aggregations, or by the ratio, if denominatorFilter and denominatorAggregations are specified.
evaluationMissingData

enum (EvaluationMissingData)

A condition control that determines how metric-threshold conditions are evaluated when data stops arriving. To use this control, the value of the duration field must be greater than or equal to 60 seconds.

Aggregation

Describes how to combine multiple time series to provide a different view of the data. Aggregation of time series is done in two steps. First, each time series in the set is aligned to the same time interval boundaries, then the set of time series is optionally reduced in number.

Alignment consists of applying the perSeriesAligner operation to each time series after its data has been divided into regular alignmentPeriod time intervals. This process takes all of the data points in an alignment period, applies a mathematical transformation such as averaging, minimum, maximum, delta, etc., and converts them into a single data point per period.

Reduction is when the aligned and transformed time series can optionally be combined, reducing the number of time series through similar mathematical transformations. Reduction involves applying a crossSeriesReducer to all the time series, optionally sorting the time series into subsets with groupByFields, and applying the reducer to each subset.

The raw time series data can contain a huge amount of information from multiple sources. Alignment and reduction transforms this mass of data into a more manageable and representative collection of data, for example "the 95% latency across the average of all tasks in a cluster". This representative data can be more easily graphed and comprehended, and the individual time series data is still available for later drilldown. For more details, see Filtering and aggregation.

JSON representation 
{
  "alignmentPeriod": string,
  "perSeriesAligner": enum (Aligner),
  "crossSeriesReducer": enum (Reducer),
  "groupByFields": [
    string
  ]
}
Fields
alignmentPeriod

string (Duration format)

The alignmentPeriod specifies a time interval, in seconds, that is used to divide the data in all the time series into consistent blocks of time. This will be done before the per-series aligner can be applied to the data.

The value must be at least 60 seconds. If a per-series aligner other than ALIGN_NONE is specified, this field is required or an error is returned. If no per-series aligner is specified, or the aligner ALIGN_NONE is specified, then this field is ignored.

The maximum value of the alignmentPeriod is 104 weeks (2 years) for charts, and 90,000 seconds (25 hours) for alerting policies.
perSeriesAligner

enum (Aligner)

An Aligner describes how to bring the data points in a single time series into temporal alignment. Except for ALIGN_NONE, all alignments cause all the data points in an alignmentPeriod to be mathematically grouped together, resulting in a single data point for each alignmentPeriod with end timestamp at the end of the period.

Not all alignment operations may be applied to all time series. The valid choices depend on the metricKind and valueType of the original time series. Alignment can change the metricKind or the valueType of the time series.

Time series data must be aligned in order to perform cross-time series reduction. If crossSeriesReducer is specified, then perSeriesAligner must be specified and not equal to ALIGN_NONE and alignmentPeriod must be specified; otherwise, an error is returned.
crossSeriesReducer

enum (Reducer)

The reduction operation to be used to combine time series into a single time series, where the value of each data point in the resulting series is a function of all the already aligned values in the input time series.

Not all reducer operations can be applied to all time series. The valid choices depend on the metricKind and the valueType of the original time series. Reduction can yield a time series with a different metricKind or valueType than the input time series.

Time series data must first be aligned (see perSeriesAligner) in order to perform cross-time series reduction. If crossSeriesReducer is specified, then perSeriesAligner must be specified, and must not be ALIGN_NONE. An alignmentPeriod must also be specified; otherwise, an error is returned.
groupByFields[]

string

The set of fields to preserve when crossSeriesReducer is specified. The groupByFields determine how the time series are partitioned into subsets prior to applying the aggregation operation. Each subset contains time series that have the same value for each of the grouping fields. Each individual time series is a member of exactly one subset. The crossSeriesReducer is applied to each subset of time series. It is not possible to reduce across different resource types, so this field implicitly contains resource.type. Fields not specified in groupByFields are aggregated away. If groupByFields is not specified and all the time series have the same resource type, then the time series are aggregated into a single output time series. If crossSeriesReducer is not defined, this field is ignored.

Aligner

The Aligner specifies the operation that will be applied to the data points in each alignment period in a time series. Except for ALIGN_NONE, which specifies that no operation be applied, each alignment operation replaces the set of data values in each alignment period with a single value: the result of applying the operation to the data values. An aligned time series has a single data value at the end of each alignmentPeriod.

An alignment operation can change the data type of the values, too. For example, if you apply a counting operation to boolean values, the data valueType in the original time series is BOOLEAN, but the valueType in the aligned result is INT64.

Enums
ALIGN_NONE No alignment. Raw data is returned. Not valid if cross-series reduction is requested. The valueType of the result is the same as the valueType of the input.
ALIGN_DELTA

Align and convert to DELTA. The output is delta = y1 - y0.

This alignment is valid for CUMULATIVE and DELTA metrics. If the selected alignment period results in periods with no data, then the aligned value for such a period is created by interpolation. The valueType of the aligned result is the same as the valueType of the input.
ALIGN_RATE

Align and convert to a rate. The result is computed as rate = (y1 - y0)/(t1 - t0), or "delta over time". Think of this aligner as providing the slope of the line that passes through the value at the start and at the end of the alignmentPeriod.

This aligner is valid for CUMULATIVE and DELTA metrics with numeric values. If the selected alignment period results in periods with no data, then the aligned value for such a period is created by interpolation. The output is a GAUGE metric with valueType DOUBLE.

If, by "rate", you mean "percentage change", see the ALIGN_PERCENT_CHANGE aligner instead.
ALIGN_INTERPOLATE Align by interpolating between adjacent points around the alignment period boundary. This aligner is valid for GAUGE metrics with numeric values. The valueType of the aligned result is the same as the valueType of the input.
ALIGN_NEXT_OLDER Align by moving the most recent data point before the end of the alignment period to the boundary at the end of the alignment period. This aligner is valid for GAUGE metrics. The valueType of the aligned result is the same as the valueType of the input.
ALIGN_MIN Align the time series by returning the minimum value in each alignment period. This aligner is valid for GAUGE and DELTA metrics with numeric values. The valueType of the aligned result is the same as the valueType of the input.
ALIGN_MAX Align the time series by returning the maximum value in each alignment period. This aligner is valid for GAUGE and DELTA metrics with numeric values. The valueType of the aligned result is the same as the valueType of the input.
ALIGN_MEAN Align the time series by returning the mean value in each alignment period. This aligner is valid for GAUGE and DELTA metrics with numeric values. The valueType of the aligned result is DOUBLE.
ALIGN_COUNT Align the time series by returning the number of values in each alignment period. This aligner is valid for GAUGE and DELTA metrics with numeric or Boolean values. The valueType of the aligned result is INT64.
ALIGN_SUM Align the time series by returning the sum of the values in each alignment period. This aligner is valid for GAUGE and DELTA metrics with numeric and distribution values. The valueType of the aligned result is the same as the valueType of the input.
ALIGN_STDDEV Align the time series by returning the standard deviation of the values in each alignment period. This aligner is valid for GAUGE and DELTA metrics with numeric values. The valueType of the output is DOUBLE.
ALIGN_COUNT_TRUE Align the time series by returning the number of True values in each alignment period. This aligner is valid for GAUGE metrics with Boolean values. The valueType of the output is INT64.
ALIGN_COUNT_FALSE Align the time series by returning the number of False values in each alignment period. This aligner is valid for GAUGE metrics with Boolean values. The valueType of the output is INT64.
ALIGN_FRACTION_TRUE Align the time series by returning the ratio of the number of True values to the total number of values in each alignment period. This aligner is valid for GAUGE metrics with Boolean values. The output value is in the range [0.0, 1.0] and has valueType DOUBLE.
ALIGN_PERCENTILE_99 Align the time series by using percentile aggregation. The resulting data point in each alignment period is the 99th percentile of all data points in the period. This aligner is valid for GAUGE and DELTA metrics with distribution values. The output is a GAUGE metric with valueType DOUBLE.
ALIGN_PERCENTILE_95 Align the time series by using percentile aggregation. The resulting data point in each alignment period is the 95th percentile of all data points in the period. This aligner is valid for GAUGE and DELTA metrics with distribution values. The output is a GAUGE metric with valueType DOUBLE.
ALIGN_PERCENTILE_50 Align the time series by using percentile aggregation. The resulting data point in each alignment period is the 50th percentile of all data points in the period. This aligner is valid for GAUGE and DELTA metrics with distribution values. The output is a GAUGE metric with valueType DOUBLE.
ALIGN_PERCENTILE_05 Align the time series by using percentile aggregation. The resulting data point in each alignment period is the 5th percentile of all data points in the period. This aligner is valid for GAUGE and DELTA metrics with distribution values. The output is a GAUGE metric with valueType DOUBLE.
ALIGN_PERCENT_CHANGE

Align and convert to a percentage change. This aligner is valid for GAUGE and DELTA metrics with numeric values. This alignment returns ((current - previous)/previous) * 100, where the value of previous is determined based on the alignmentPeriod.

If the values of current and previous are both 0, then the returned value is 0. If only previous is 0, the returned value is infinity.

A 10-minute moving mean is computed at each point of the alignment period prior to the above calculation to smooth the metric and prevent false positives from very short-lived spikes. The moving mean is only applicable for data whose values are >= 0. Any values < 0 are treated as a missing datapoint, and are ignored. While DELTA metrics are accepted by this alignment, special care should be taken that the values for the metric will always be positive. The output is a GAUGE metric with valueType DOUBLE.

Reducer

A Reducer operation describes how to aggregate data points from multiple time series into a single time series, where the value of each data point in the resulting series is a function of all the already aligned values in the input time series.

Enums
REDUCE_NONE No cross-time series reduction. The output of the Aligner is returned.
REDUCE_MEAN Reduce by computing the mean value across time series for each alignment period. This reducer is valid for DELTA and GAUGE metrics with numeric or distribution values. The valueType of the output is DOUBLE.
REDUCE_MIN Reduce by computing the minimum value across time series for each alignment period. This reducer is valid for DELTA and GAUGE metrics with numeric values. The valueType of the output is the same as the valueType of the input.
REDUCE_MAX Reduce by computing the maximum value across time series for each alignment period. This reducer is valid for DELTA and GAUGE metrics with numeric values. The valueType of the output is the same as the valueType of the input.
REDUCE_SUM Reduce by computing the sum across time series for each alignment period. This reducer is valid for DELTA and GAUGE metrics with numeric and distribution values. The valueType of the output is the same as the valueType of the input.
REDUCE_STDDEV Reduce by computing the standard deviation across time series for each alignment period. This reducer is valid for DELTA and GAUGE metrics with numeric or distribution values. The valueType of the output is DOUBLE.
REDUCE_COUNT Reduce by computing the number of data points across time series for each alignment period. This reducer is valid for DELTA and GAUGE metrics of numeric, Boolean, distribution, and string valueType. The valueType of the output is INT64.
REDUCE_COUNT_TRUE Reduce by computing the number of True-valued data points across time series for each alignment period. This reducer is valid for DELTA and GAUGE metrics of Boolean valueType. The valueType of the output is INT64.
REDUCE_COUNT_FALSE Reduce by computing the number of False-valued data points across time series for each alignment period. This reducer is valid for DELTA and GAUGE metrics of Boolean valueType. The valueType of the output is INT64.
REDUCE_FRACTION_TRUE Reduce by computing the ratio of the number of True-valued data points to the total number of data points for each alignment period. This reducer is valid for DELTA and GAUGE metrics of Boolean valueType. The output value is in the range [0.0, 1.0] and has valueType DOUBLE.
REDUCE_PERCENTILE_99 Reduce by computing the 99th percentile of data points across time series for each alignment period. This reducer is valid for GAUGE and DELTA metrics of numeric and distribution type. The value of the output is DOUBLE.
REDUCE_PERCENTILE_95 Reduce by computing the 95th percentile of data points across time series for each alignment period. This reducer is valid for GAUGE and DELTA metrics of numeric and distribution type. The value of the output is DOUBLE.
REDUCE_PERCENTILE_50 Reduce by computing the 50th percentile of data points across time series for each alignment period. This reducer is valid for GAUGE and DELTA metrics of numeric and distribution type. The value of the output is DOUBLE.
REDUCE_PERCENTILE_05 Reduce by computing the 5th percentile of data points across time series for each alignment period. This reducer is valid for GAUGE and DELTA metrics of numeric and distribution type. The value of the output is DOUBLE.

ForecastOptions

Options used when forecasting the time series and testing the predicted value against the threshold.

JSON representation 
{
  "forecastHorizon": string
}
Fields
forecastHorizon

string (Duration format)

Required. The length of time into the future to forecast whether a time series will violate the threshold. If the predicted value is found to violate the threshold, and the violation is observed in all forecasts made for the configured duration, then the time series is considered to be failing. The forecast horizon can range from 1 hour to 60 hours.

ComparisonType

Specifies an ordering relationship on two arguments, called left and right.

Enums
COMPARISON_UNSPECIFIED No ordering relationship is specified.
COMPARISON_GT True if the left argument is greater than the right argument.
COMPARISON_GE True if the left argument is greater than or equal to the right argument.
COMPARISON_LT True if the left argument is less than the right argument.
COMPARISON_LE True if the left argument is less than or equal to the right argument.
COMPARISON_EQ True if the left argument is equal to the right argument.
COMPARISON_NE True if the left argument is not equal to the right argument.

Trigger

Specifies how many time series must fail a predicate to trigger a condition. If not specified, then a {count: 1} trigger is used.

JSON representation 
{

  // Union field type can be only one of the following:
  "count": integer,
  "percent": number
  // End of list of possible types for union field type.
}
Fields
Union field type. A type of trigger. type can be only one of the following:
count

integer

The absolute number of time series that must fail the predicate for the condition to be triggered.
percent

number

The percentage of time series that must fail the predicate for the condition to be triggered.

EvaluationMissingData

A condition control that determines how metric-threshold conditions are evaluated when data stops arriving. This control doesn't affect metric-absence policies.

Enums
EVALUATION_MISSING_DATA_UNSPECIFIED An unspecified evaluation missing data option. Equivalent to EVALUATION_MISSING_DATA_NO_OP.
EVALUATION_MISSING_DATA_INACTIVE If there is no data to evaluate the condition, then evaluate the condition as false.
EVALUATION_MISSING_DATA_ACTIVE If there is no data to evaluate the condition, then evaluate the condition as true.
EVALUATION_MISSING_DATA_NO_OP Do not evaluate the condition to any value if there is no data.

MetricAbsence

A condition type that checks that monitored resources are reporting data. The configuration defines a metric and a set of monitored resources. The predicate is considered in violation when a time series for the specified metric of a monitored resource does not include any data in the specified duration.

JSON representation 
{
  "filter": string,
  "aggregations": [
    {
      object (Aggregation)
    }
  ],
  "duration": string,
  "trigger": {
    object (Trigger)
  }
}
Fields
filter

string

Required. A filter that identifies which time series should be compared with the threshold.

The filter is similar to the one that is specified in the timeSeries.list request (that call is useful to verify the time series that will be retrieved / processed). The filter must specify the metric type and the resource type. Optionally, it can specify resource labels and metric labels. This field must not exceed 2048 Unicode characters in length.
aggregations[]

object (Aggregation)

Specifies the alignment of data points in individual time series as well as how to combine the retrieved time series together (such as when aggregating multiple streams on each resource to a single stream for each resource or when aggregating streams across all members of a group of resources). Multiple aggregations are applied in the order specified.

This field is similar to the one in the timeSeries.list request. It is advisable to use the timeSeries.list method when debugging this field.
duration

string (Duration format)

The amount of time that a time series must fail to report new data to be considered failing. The minimum value of this field is 120 seconds. Larger values that are a multiple of a minute--for example, 240 or 300 seconds--are supported. If an invalid value is given, an error will be returned. The Duration.nanos field is ignored.
trigger

object (Trigger)

The number/percent of time series for which the comparison must hold in order for the condition to trigger. If unspecified, then the condition will trigger if the comparison is true for any of the time series that have been identified by filter and aggregations.

LogMatch

A condition type that checks whether a log message in the scoping project satisfies the given filter. Logs from other projects in the metrics scope are not evaluated.

JSON representation 
{
  "filter": string,
  "labelExtractors": {
    string: string,
    ...
  }
}
Fields
filter

string

Required. A logs-based filter. See Advanced Logs Queries for how this filter should be constructed.
labelExtractors

map (key: string, value: string)

Optional. A map from a label key to an extractor expression, which is used to extract the value for this label key. Each entry in this map is a specification for how data should be extracted from log entries that match filter. Each combination of extracted values is treated as a separate rule for the purposes of triggering notifications. Label keys and corresponding values can be used in notifications generated by this condition.

Please see the documentation on logs-based metric valueExtractors for syntax and examples.

MonitoringQueryLanguageCondition

A condition type that allows alerting policies to be defined using Monitoring Query Language.

JSON representation 
{
  "query": string,
  "duration": string,
  "trigger": {
    object (Trigger)
  },
  "evaluationMissingData": enum (EvaluationMissingData)
}
Fields
query

string

Monitoring Query Language query that outputs a boolean stream.
duration

string (Duration format)

The amount of time that a time series must violate the threshold to be considered failing. Currently, only values that are a multiple of a minute--e.g., 0, 60, 120, or 300 seconds--are supported. If an invalid value is given, an error will be returned. When choosing a duration, it is useful to keep in mind the frequency of the underlying time series data (which may also be affected by any alignments specified in the aggregations field); a good duration is long enough so that a single outlier does not generate spurious alerts, but short enough that unhealthy states are detected and alerted on quickly.
trigger

object (Trigger)

The number/percent of time series for which the comparison must hold in order for the condition to trigger. If unspecified, then the condition will trigger if the comparison is true for any of the time series that have been identified by filter and aggregations, or by the ratio, if denominatorFilter and denominatorAggregations are specified.
evaluationMissingData

enum (EvaluationMissingData)

A condition control that determines how metric-threshold conditions are evaluated when data stops arriving.

PrometheusQueryLanguageCondition

A condition type that allows alerting policies to be defined using Prometheus Query Language (PromQL).

The PrometheusQueryLanguageCondition message contains information from a Prometheus alerting rule and its associated rule group.

A Prometheus alerting rule is described here. The semantics of a Prometheus alerting rule is described here.

A Prometheus rule group is described here. The semantics of a Prometheus rule group is described here.

Because Cloud Alerting has no representation of a Prometheus rule group resource, we must embed the information of the parent rule group inside each of the conditions that refer to it. We must also update the contents of all Prometheus alerts in case the information of their rule group changes.

The PrometheusQueryLanguageCondition protocol buffer combines the information of the corresponding rule group and alerting rule. The structure of the PrometheusQueryLanguageCondition protocol buffer does NOT mimic the structure of the Prometheus rule group and alerting rule YAML declarations. The PrometheusQueryLanguageCondition protocol buffer may change in the future to support future rule group and/or alerting rule features. There are no new such features at the present time (2023-06-26).

JSON representation 
{
  "query": string,
  "duration": string,
  "evaluationInterval": string,
  "labels": {
    string: string,
    ...
  },
  "ruleGroup": string,
  "alertRule": string
}
Fields
query

string

Required. The PromQL expression to evaluate. Every evaluation cycle this expression is evaluated at the current time, and all resultant time series become pending/firing alerts. This field must not be empty.
duration

string (Duration format)

Optional. Alerts are considered firing once their PromQL expression was evaluated to be "true" for this long. Alerts whose PromQL expression was not evaluated to be "true" for long enough are considered pending. Must be a non-negative duration or missing. This field is optional. Its default value is zero.
evaluationInterval

string (Duration format)

Optional. How often this rule should be evaluated. Must be a positive multiple of 30 seconds or missing. This field is optional. Its default value is 30 seconds. If this PrometheusQueryLanguageCondition was generated from a Prometheus alerting rule, then this value should be taken from the enclosing rule group.
labels

map (key: string, value: string)

Optional. Labels to add to or overwrite in the PromQL query result. Label names must be valid. Label values can be templatized by using variables. The only available variable names are the names of the labels in the PromQL result, including "__name__" and "value". "labels" may be empty.
ruleGroup

string

Optional. The rule group name of this alert in the corresponding Prometheus configuration file.

Some external tools may require this field to be populated correctly in order to refer to the original Prometheus configuration file. The rule group name and the alert name are necessary to update the relevant AlertPolicies in case the definition of the rule group changes in the future.

This field is optional. If this field is not empty, then it must contain a valid UTF-8 string. This field may not exceed 2048 Unicode characters in length.
alertRule

string

Optional. The alerting rule name of this alert in the corresponding Prometheus configuration file.

Some external tools may require this field to be populated correctly in order to refer to the original Prometheus configuration file. The rule group name and the alert name are necessary to update the relevant AlertPolicies in case the definition of the rule group changes in the future.

This field is optional. If this field is not empty, then it must be a valid Prometheus label name. This field may not exceed 2048 Unicode characters in length.

SqlCondition

A condition that allows alerting policies to be defined using GoogleSQL. SQL conditions examine a sliding window of logs using GoogleSQL. Alert policies with SQL conditions may incur additional billing.

JSON representation 
{
  "query": string,

  // Union field schedule can be only one of the following:
  "minutes": {
    object (Minutes)
  },
  "hourly": {
    object (Hourly)
  },
  "daily": {
    object (Daily)
  }
  // End of list of possible types for union field schedule.

  // Union field evaluate can be only one of the following:
  "rowCountTest": {
    object (RowCountTest)
  },
  "booleanTest": {
    object (BooleanTest)
  }
  // End of list of possible types for union field evaluate.
}
Fields
query

string

Required. The Log Analytics SQL query to run, as a string. The query must conform to the required shape. Specifically, the query must not try to filter the input by time. A filter will automatically be applied to filter the input so that the query receives all rows received since the last time the query was run.

For example, the following query extracts all log entries containing an HTTP request:

SELECT timestamp, logName, severity, httpRequest, resource, labels FROM my-project.global._Default._AllLogs WHERE httpRequest IS NOT NULL
Union field schedule. The schedule indicates how often the query should be run. schedule can be only one of the following:
minutes

object (Minutes)

Schedule the query to execute every so many minutes.
hourly

object (Hourly)

Schedule the query to execute every so many hours.
daily

object (Daily)

Schedule the query to execute every so many days.
Union field evaluate. The test to be run against the SQL result set. evaluate can be only one of the following:
rowCountTest

object (RowCountTest)

Test the row count against a threshold.
booleanTest

object (BooleanTest)

Test the boolean value in the indicated column.

Minutes

Used to schedule the query to run every so many minutes.

JSON representation 
{
  "periodicity": integer
}
Fields
periodicity

integer

Required. Number of minutes between runs. The interval must be greater than or equal to 5 minutes and less than or equal to 1440 minutes.

Hourly

Used to schedule the query to run every so many hours.

JSON representation 
{
  "periodicity": integer,
  "minuteOffset": integer
}
Fields
periodicity

integer

Required. The number of hours between runs. Must be greater than or equal to 1 hour and less than or equal to 48 hours.
minuteOffset

integer

Optional. The number of minutes after the hour (in UTC) to run the query. Must be greater than or equal to 0 minutes and less than or equal to 59 minutes. If left unspecified, then an arbitrary offset is used.

Daily

Used to schedule the query to run every so many days.

JSON representation 
{
  "periodicity": integer,
  "executionTime": {
    object (TimeOfDay)
  }
}
Fields
periodicity

integer

Required. The number of days between runs. Must be greater than or equal to 1 day and less than or equal to 31 days.
executionTime

object (TimeOfDay)

Optional. The time of day (in UTC) at which the query should run. If left unspecified, the server picks an arbitrary time of day and runs the query at the same time each day.

TimeOfDay

Represents a time of day. The date and time zone are either not significant or are specified elsewhere. An API may choose to allow leap seconds. Related types are google.type.Date and google.protobuf.Timestamp.

JSON representation 
{
  "hours": integer,
  "minutes": integer,
  "seconds": integer,
  "nanos": integer
}
Fields
hours

integer

Hours of a day in 24 hour format. Must be greater than or equal to 0 and typically must be less than or equal to 23. An API may choose to allow the value "24:00:00" for scenarios like business closing time.
minutes

integer

Minutes of an hour. Must be greater than or equal to 0 and less than or equal to 59.
seconds

integer

Seconds of a minute. Must be greater than or equal to 0 and typically must be less than or equal to 59. An API may allow the value 60 if it allows leap-seconds.
nanos

integer

Fractions of seconds, in nanoseconds. Must be greater than or equal to 0 and less than or equal to 999,999,999.

RowCountTest

A test that checks if the number of rows in the result set violates some threshold.

JSON representation 
{
  "comparison": enum (ComparisonType),
  "threshold": string
}
Fields
comparison

enum (ComparisonType)

Required. The comparison to apply between the number of rows returned by the query and the threshold.
threshold

string (int64 format)

Required. The value against which to compare the row count.

BooleanTest

A test that uses an alerting result in a boolean column produced by the SQL query.

JSON representation 
{
  "column": string
}
Fields
column

string

Required. The name of the column containing the boolean value. If the value in a row is NULL, that row is ignored.

ConditionCombinerType

Operators for combining conditions.

Enums
COMBINE_UNSPECIFIED An unspecified combiner.
AND Combine conditions using the logical AND operator. An incident is created only if all the conditions are met simultaneously. This combiner is satisfied if all conditions are met, even if they are met on completely different resources.
OR Combine conditions using the logical OR operator. An incident is created if any of the listed conditions is met.
AND_WITH_MATCHING_RESOURCE Combine conditions using logical AND operator, but unlike the regular AND option, an incident is created only if all conditions are met simultaneously on at least one resource.

AlertStrategy

Control over how the notification channels in notificationChannels are notified when this alert fires.

JSON representation 
{
  "notificationRateLimit": {
    object (NotificationRateLimit)
  },
  "notificationPrompts": [
    enum (NotificationPrompt)
  ],
  "autoClose": string,
  "notificationChannelStrategy": [
    {
      object (NotificationChannelStrategy)
    }
  ]
}
Fields
notificationRateLimit

object (NotificationRateLimit)

Required for log-based alerting policies, i.e. policies with a LogMatch condition.

This limit is not implemented for alerting policies that do not have a LogMatch condition.
notificationPrompts[]

enum (NotificationPrompt)

For log-based alert policies, the notification prompts is always [OPENED]. For non log-based alert policies, the notification prompts can be [OPENED] or [OPENED, CLOSED].
autoClose

string (Duration format)

If an alerting policy that was active has no data for this long, any open incidents will close
notificationChannelStrategy[]

object (NotificationChannelStrategy)

Control how notifications will be sent out, on a per-channel basis.

NotificationRateLimit

Control over the rate of notifications sent to this alerting policy's notification channels.

JSON representation 
{
  "period": string
}
Fields
period

string (Duration format)

Not more than one notification per period.

NotificationPrompt

Control when notifications will be sent out.

Enums
NOTIFICATION_PROMPT_UNSPECIFIED No strategy specified. Treated as error.
OPENED Notify when an incident is opened.
CLOSED Notify when an incident is closed.

NotificationChannelStrategy

Control over how the notification channels in notificationChannels are notified when this alert fires, on a per-channel basis.

JSON representation 
{
  "notificationChannelNames": [
    string
  ],
  "renotifyInterval": string
}
Fields
notificationChannelNames[]

string

The full REST resource name for the notification channels that these settings apply to. Each of these correspond to the name field in one of the NotificationChannel objects referenced in the notificationChannels field of this AlertPolicy. The format is:

projects/[PROJECT_ID_OR_NUMBER]/notificationChannels/[CHANNEL_ID]
renotifyInterval

string (Duration format)

The frequency at which to send reminder notifications for open incidents.

Severity

An enumeration of possible severity level for an alerting policy.

Enums
SEVERITY_UNSPECIFIED No severity is specified. This is the default value.
CRITICAL This is the highest severity level. Use this if the problem could cause significant damage or downtime.
ERROR This is the medium severity level. Use this if the problem could cause minor damage or downtime.
WARNING This is the lowest severity level. Use this if the problem is not causing any damage or downtime, but could potentially lead to a problem in the future.

Methods

create

 Creates a new alerting policy.

delete

 Deletes an alerting policy.

get

 Gets a single alerting policy.

list

 Lists the existing alerting policies for the workspace.

patch

 Updates an alerting policy.