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Working with Prometheus Metrics

Adding to the library

We strive to support the 2-4 most important metrics for each common system service that supports Prometheus. If you are looking for support for a particular exporter which has not yet been added to the library, additions can be made to the common_metrics.yml file.

Query identifier

The requirement for adding a new metric is to make each query to have an unique identifier which is used to update the metric later when changed:

- group: Response metrics (NGINX Ingress)
  metrics:
    - title: "Throughput"
      y_axis:
        name: "Requests / Sec"
        format: "number"
        precision: 2
      queries:
        - id: response_metrics_nginx_ingress_throughput_status_code
          query_range: 'sum(rate(nginx_upstream_responses_total{upstream=~"%{kube_namespace}-%{ci_environment_slug}-.*"}[2m])) by (status_code)'
          unit: req / sec
          label: Status Code

Update existing metrics

After you add or change an existing common metric, you must re-run the import script that queries and updates all existing metrics.

Or, you can create a database migration:

class ImportCommonMetrics < ActiveRecord::Migration[4.2]
  include Gitlab::Database::MigrationHelpers

  DOWNTIME = false

  def up
    ::Gitlab::DatabaseImporters::CommonMetrics::Importer.new.execute
  end

  def down
    # no-op
  end
end

If a query metric (which is identified by id:) is removed, it isn't removed from database by default. You might want to add additional database migration that makes a decision what to do with removed one. For example: you might be interested in migrating all dependent data to a different metric.

GitLab Prometheus metrics

GitLab provides Prometheus metrics to monitor itself.

Adding a new metric

This section describes how to add new metrics for self-monitoring (example).

Select the type of metric:
- Gitlab::Metrics.counter
- Gitlab::Metrics.gauge
- Gitlab::Metrics.histogram
- Gitlab::Metrics.summary
Select the appropriate name for your metric. Refer to the guidelines for Prometheus metric names.
Update the list of GitLab Prometheus metrics.
Trigger the relevant page or code that records the new metric.
Check that the new metric appears at /-/metrics.

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