Influxdb

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

LinDB is a scalable, high performance, high availability distributed time series database.

The Prometheus monitoring system and time series database.

Agent for collecting, processing, aggregating, and writing metrics, logs, and other arbitrary data.

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

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