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ref https://linear.app/ghost/issue/ENG-1769/improve-pool-utilization-metric - Currently the connection pool metrics are all point in time metrics, and with a scrape interval of 15s this doesn't tell us a whole lot about what's happening in the pool. - This commit adds a Summary metric to track the elapsed time each transaction has to wait to acquire a connection from the pool, which should be a good indication of contention in the pool. - Also moved the call to `prometheusClient.instrumentKnex` to after `initCore` in the boot process, because the metric depends on event listeners on `knex.client.pool`, and the pool gets destroyed and recreated in `initCore`, which removes the listeners |
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