feat: add cluster metrics promex plugin - #690
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Metrics cluster size and erpc response time
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### Features - **Authentication cleartext password support** - Added support for cleartext password authentication method (#707) - **Runtime-configurable connection retries** - Support for runtime configuration of connection retries and infinite retries (#705) - **Enhanced health checks** - Check database and eRPC capabilities during health check operations (#691) - **More consistency with postgres on auth errors** - Improves errors in some client libraries (#711) ### Performance Improvements - **Optimized ranch usage** - Supavisor now uses a constant number of ranch instances for improved performance and resource management when hosting a large number of pools (#706) ### Monitoring - **New OS memory metrics** - gives a more accurate picture of memory usage (#704) - **Add a promex plugin for cluster metrics** - for tracking latency and connection status (#690) - **Client connection lifetime metrics** - adds a metric about how long each connection is connected for (#688) - **Process monitoring** - Log when large process heaps and long message queues (#689) ### Bug Fixes - **Client handler query cancellation** - Fixed handling of `:cancel_query` when state is `:idle` (#692) ### Migration Notes - Instances running a small number of pools may see an increase in memory usage. This can be mitigated by changing the ranch shard or the acceptor counts. - If using any of the new used ports, may need to change the defaults - Review monitoring dashboards and include new metrics
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This is coming from a situation where we had a bad node in the cluster causing problems to the others. The goal is to be able to see such situations in Grafana, and detect them early.