Nightingale

The Prometheus monitoring system and time series database.

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

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

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

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

Open-source status page, incident response and uptime monitoring