Micrometer

VictoriaMetrics: fast, cost-effective monitoring solution and time series database

Highly available Prometheus setup with long term storage capabilities. A CNCF Incubating project.

Nightingale is to monitoring and alerting what Grafana is to visualization.

highlight.io: The open source, full-stack monitoring platform. Error monitoring, session replay, logging, distributed tracing, and more.

OpenTelemetry Collector

Add-on agent to generate and expose cluster-level metrics.