Monitor callout backend services

This page describes how to monitor Application Load Balancer extension backend services that are configured using Service Extensions.

For a product overview, see Service Extensions overview.

View a Monitoring dashboard

Application Load Balancers export monitoring data to Cloud Monitoring.

Use Monitoring metrics for the following purposes:

  • Evaluating a load balancer's configuration, usage, and performance
  • Troubleshooting problems
  • Improving resource utilization and user experience

To view a predefined dashboard, follow these steps:

  1. In the Google Cloud console, go to the Dashboards overview page.

    Go to Dashboards overview

  2. In the Categories section, click GCP.
    • To view a list of dashboards for all your load balancers, in the GCP Dashboards list, click the dashboard named Google Cloud Load Balancers. To view a specific load balancer's dashboard, locate the load balancer in the list and click its name.
    • To view the predefined dashboards for only your load balancers, select the appropriate dashboard.

In addition to the predefined dashboards in Monitoring, you can create custom dashboards, set up alerts, and query the metrics through the Cloud Monitoring API.

For more information, see the "Monitor and troubleshoot" pages of the Cloud Load Balancing documentation—for example, Internal Application Load Balancer logging and monitoring.

Monitoring metrics for callouts

You can monitor the following metrics for callout backend services.

These metrics have the prefix loadbalancing.googleapis.com/. The prefix is omitted from the entries in the table.

Metric type Display name
Kind, Type, Unit
Description
https/backend_request_count,
https/external/regional/backend_request_count,
https/internal/backend_request_count 		Backend request count
DELTA, INT64, 1
The number of times that a plugin is called from the Application Load Balancer.
https/backend_request_bytes_count,
https/external/regional/backend_request_bytes_count,
https/internal/backend_request_bytes_count 		Backend request bytes
DELTA, INT64, By
The number of bytes sent from the load balancer to the plugin.
https/backend_response_bytes_count,
https/external/regional/backend_response_bytes_count,
https/internal/backend_response_bytes_count 		Backend response bytes
DELTA, INT64, By
The number of bytes received by the load balancer from the extension backend.

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