Commits on Apr 1, 2023

1. feat: add initial prometheus metrics support …

   ---
   Metrics for the prometheus endpoint are slightly different from the json one.
   - I do not want to break things for those that use the old endpoint.
   - Some metrics are hard to utilize in Prometheus without a format
     change. (example: certificate timestamp)
     - Usually blackbox_exporter would cover certificate monitoring, but
       since people use TRMM with multiple proxies both internal monitoring
       and blackbox_exporter may be useful.
   - Memory and disk space was not transfered because they are system wide
     and Prometheus users likely will have node_exporter installed for
     that.
   - Prometheus format has slightly more detailed metrics.
   
   ---
   Instructions:
   1. Setup MON_TOKEN variable in
      `/rmm/api/tacticalrmm/tacticalrmm/local_settings.py` for your bearer_token.
      This is the same as for the json endpoint. See [Tips and Tricks](https://docs.tacticalrmm.com/tipsntricks/#monitor-your-trmm-instance-via-the-built-in-monitoring-endpoint).
   2. Test with curl command:
      `curl -s -H "Authorization: Bearer $MON_TOKEN" https://api.trmm.example.com/core/status/`
   3. Setup Prometheus job with:
   ```
   - job_name: trmm
     scrape_interval: 60s
     metrics_path: /core/status/
     scheme: https
     bearer_token: $MON_TOKEN
     static_configs:
     - targets:
       - api.trmm.example.com
   ```

   

   ykuksenko committed Apr 1, 2023
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