[SaveTheRbtz]

We're mostly on the Grafana stack, so we tend to favor their open-source solutions for metric backends. For client libraries, we're currently using Prometheus for metrics and OpenTelemetry (OTEL) for tracing, but we're looking to migrate fully to OTEL once metrics are stable there. As for logging, it depends on the project, but generally we use either Zerolog or Zap, with either Loki Docker plugin or Promtail.