Pmm

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

Scalable datastore for metrics, events, and real-time analytics

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

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

Continuous Profiling Platform. Debug performance issues down to a single line of code

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