Prometheus

Prometheus is a monitoring system and time-series database.

Key Features:

Multidimensional data model, where time series data is identified by metric names and key/value pairs.
PromQL, a flexible query language that leverages this dimensionality.
No reliance on distributed storage; single server nodes are autonomous.
Time series collection is performed via a pull model over HTTP.
Supports pushing time series via an intermediary gateway.
Targets are discovered via service discovery or static configuration.
Multiple modes of graphing and dashboard support.