Grafana Agent

This sets up the grafana agent to send metrics to a remote prometheus remote_write compatible endpoint. So far, only the integrated node_exporter is configured.

Config options

• grafana_agent_prometheus_scrapes: Allows you to pass through Prometheus scraping blocks
• grafana_agent_logs_scrape: Allows you to pass through loki scraping blocks
• grafana_agent_blackbox_targets: Allows you to pass through blackbox scraping blocks

Note: Both options also exist with _host, _group_a, _group_b, _group_c and _special suffixes. All values are merged together in the role - this allows you to sidestep group var merging issues.

Logs

You can enable log-collection using the integrated Promtail. For this, the variables grafana_agent_logs_scrape_config and grafana_agent_logs_client_url must be set. The latter is a Loki-endpoint to which the logs will be sent. An example for grafana_agent_logs_scrape_config is:

grafana_agent_logs_scrape_config:
  - job_name: varlogs
    static_configs:
      - targets: [localhost]
        labels:
          job: varlogs
          __path__: /var/log/*log
          hostname: "{{ ansible_fqdn }}"

Blackbox (Website probes)

Set grafana_agent_enable_blackbox to true and add the targets you want to be probed in grafana_agent_blackbox_targets, e.g:

grafana_agent_blackbox_targets:
  - name: example
    address: example.com
    module: http_2xx

The module must be a blackbox module defined in grafana_agent_blackbox_module_config.

Postgres exporter

Follow the official documentation on how to configure a separate user for the agent. This will configure the DB for user postgres_exporter. Specify database postgres and your user (e.g. postgres_exporter) in grafana_agent_prometheus_postgresexporter_datasourcenames:

"psql://postgres_exporter:[email protected]/postgres"