Disable collection of metrics

Disable collection of all metrics

To prevent the collection of all metrics, disable the Cloud Monitoring API:

gcloud services disable monitoring.googleapis.com

Disable collection of process metrics

There are multiple ways you can disable the collection of these metrics by the Ops Agent (versions 2.0.0 and higher) and by the legacy Monitoring agent on Linux.

The agents run only on Compute Engine VMs and, for the Monitoring agent, Amazon Elastic Compute Cloud (EC2) VMs; these procedures apply only to those platforms.

You can't disable collection by the Ops Agent if you are running versions less than 2.0.0 or the legacy Monitoring agent on Windows. If you want to disable collection of these metrics on Windows, we recommend that you upgrade to the Ops Agent version 2.0.0 or higher. For more information, see Installing the Ops Agent.

The general procedure looks like this:

1. Connect to the VM.

2. Make a copy of the existing configuration file as a back up. Store the back-up copy outside the agent's configuration directory, so the agent doesn't attempt to load both files. For example, the following command makes a copy of the configuration file for the Monitoring agent on Linux:

   cp /etc/stackdriver/collectd.conf BACKUP_DIR/collectd.conf.bak
   

3. Change the configuration using one of the options described in the following:

   • Ops Agent on Linux or Windows
   • Monitoring agent on Linux

4. Restart the agent, to pick up the new configuration:

   • Monitoring agent: sudo service stackdriver-agent restart
   • Ops Agent: sudo service google-cloud-ops-agent restart

5. Verify that the process metrics are no longer being collected for this VM:

   1. Select Metrics explorer.

   2. Click MQL.

   3. For a gce_instance resource, enter the following query, replacing VM_NAME with the name of this VM:

      fetch gce_instance
      | metric 'agent.googleapis.com/processes/cpu_time'
      | filter (metadata.system_labels.name == 'VM_NAME')
      | align rate(1m)
      | every 1m
      

      For an aws_ec2_instance resource, replace gce_instance in the query.

   4. Click Run Query.

Ops Agent on Linux or Windows

The location of the configuration file for the Ops Agent depends on the operating system:

• For Linux: /etc/google-cloud-ops-agent/config.yaml
• For Windows: C:\Program Files\Google\Cloud Operations\Ops Agent\config\config.yaml

To disable the collection of all process metrics by the Ops Agent, add the following to your config.yaml file:

metrics:
  processors:
    metrics_filter:
      type: exclude_metrics
      metrics_pattern:
      - agent.googleapis.com/processes/*

This excludes process metrics from collection in the metrics_filter processor that applies to the default pipeline in the metrics service.

For more information about configuration options for the Ops Agent, see Configuring the Ops Agent.

Monitoring agent on Linux

You have the following options for disabling the collection of process metrics with the legacy Monitoring agent:

• Modify the agent's configuration file.
• Replace the agent's configuration file.

The following sections describe each option and list the benefits and risks associated with that option.

Modify the agent's configuration file

With this option, you directly edit the agent's main configuration file, /etc/stackdriver/collectd.conf, to remove the sections that enable the collection of the process metrics.

Procedure

There are three groups of deletions you need to make to the collectd.conf file:

1. Delete the following LoadPlugin directive and plugin configuration:

   LoadPlugin processes
   
   <Plugin "processes">
     ProcessMatch "all" ".*"
     Detail "ps_cputime"
     Detail "ps_disk_octets"
     Detail "ps_rss"
     Detail "ps_vm"
   </Plugin>
   

2. Delete the following PostCacheChain directive and the configuration of the PostCache chain:

   PostCacheChain "PostCache"
   
   <Chain "PostCache">
     <Rule "processes">
       <Match "regex">
         Plugin "^processes$"
         Type "^(ps_cputime|disk_octets|ps_rss|ps_vm)$"
       </Match>
       <Target "jump">
         Chain "MaybeThrottleProcesses"
       </Target>
       Target "stop"
     </Rule>
   
     <Rule "otherwise">
       <Match "throttle_metadata_keys">
         OKToThrottle false
         HighWaterMark 5700000000  # 950M * 6
         LowWaterMark 4800000000  # 800M * 6
       </Match>
       <Target "write">
          Plugin "write_gcm"
       </Target>
     </Rule>
   </Chain>
   

3. Delete the MaybeThrottleProcesses chain used by the PostCache chain:

   <Chain "MaybeThrottleProcesses">
     <Rule "default">
       <Match "throttle_metadata_keys">
         OKToThrottle true
         TrackedMetadata "processes:pid"
         TrackedMetadata "processes:command"
         TrackedMetadata "processes:command_line"
         TrackedMetadata "processes:owner"
       </Match>
       <Target "write">
          Plugin "write_gcm"
       </Target>
     </Rule>
   </Chain>
   

Benefits and risks

• Benefits
  • You reduce the resources consumed by the agent, because the metrics are never collected.
  • If you have made other changes to your collectd.conf file, you might be able to easily preserve those changes.
• Risks
  • You must use the root account to edit this configuration file.
  • You risk introducing typographical errors into the file.

Replace the agent's configuration file

With this option, you replace the agent's main configuration file with a pre-edited version that has the relevant sections removed for you.

Procedure

1. Download the pre-edited file, collectd-no-process-metrics.conf, from the GitHub repository to the /tmp directory, and then do the following:

   cd /tmp && curl -sSO https://raw.githubusercontent.com/Stackdriver/agent-packaging/master/collectd-no-process-metrics.conf
   

2. Replace the existing collectd.conf file with the pre-edited file:

   cp /tmp/collectd-no-process-metrics.conf /etc/stackdriver/collectd.conf
   

Benefits and risks

• Benefits
  • You reduce resources consumed by the agent because the metrics are never collected.
  • You don't have to manually edit the file as root.
  • Configuration-management tools can easily replace a file.
• Risks
  • If you have made other changes to the collectd.conf file, you have to merge those changes into the replacement file.

Troubleshooting

The procedures described in this document are changes to the configuration of the agent, so the following problems are most likely:

• Insufficient privilege to edit the configuration files. Configuration files must be edited from the root account.
• Introduction of typographical errors into the configuration file, if you edit it directly.

For information on resolving other problems, see Troubleshooting the Monitoring agent.

Monitoring agent on Windows

You can't disable the collection of process metrics by the legacy Monitoring agent running on Windows VMs. This agent is not configurable. If you want to disable collection of these metrics on Windows, we recommend that you upgrade to the Ops Agent version 2.0.0 or higher. For more information, see Installing the Ops Agent.

If you are running the Ops Agent, see Ops Agent on Linux or Windows.