1.7 KiB
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_label: "Requests / Sec"
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 existing common metric you have to create a new database migration that will query and update all existing metrics.
NOTE: Note:
If a query metric (which is identified by id:) is removed it will not be 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.
class ImportCommonMetrics < ActiveRecord::Migration
include Gitlab::Database::MigrationHelpers
require Rails.root.join('db/importers/common_metrics_importer.rb')
DOWNTIME = false
def up
Importers::CommonMetricsImporter.new.execute
end
def down
# no-op
end
end