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Add metrics endpoints #665

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Add metrics endpoints #665

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Commits on Aug 14, 2023

  1. backend: Add metrics endpoints 

    Pull request #656 adds the necessary instance_stats database table as well as functions for querying instance counts (by channel, version, and architecture) from the groups, instance, and instance_application tables and storing the results in the new table.

To make this data accessible outside Nebraska, we create the following:

- Prometheus metrics endpoint: A new HTTP endpoint (instance-metrics/prometheus) that serves only the latest snapshot from the instance_stats table. As Prometheus is a time-series database, this serves instance counts with the latest timestamp only.
- JSON metrics data endpoint: A new HTTP endpoint that emits all instance_stats data in JSON format. The difference here is that we query for all data, and we emit one JSON document per row.
    @skoeva
    skoeva committed Aug 14, 2023
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