Datadog - See metrics from all of your apps, tools & services in one place with Datadog's cloud monitoring as a service solution. Try it for free.
InfluxData - Scalable datastore for metrics, events, and real-time analytics.
AppDynamics - Get real-time insight from your apps using Application Performance Management—how they’re being used, how they’re performing, where they need help.
TimescaleDB - TimescaleDB is a time-series SQL database providing fast analytics, scalability, with automated data management on a proven storage engine.
Zabbix - Track, record, alert and visualize performance and availability of IT resources
VictoriaMetrics - Cost-effective database for huge amounts of time series data