Prometheus is an open-source systems monitoring and alerting toolkit originally built at SoundCloud. Prometheus's main features are:

• a multi-dimensional data model (time series identified by metric name and key/value pairs)
• a flexible query language to leverage this dimensionality
• no reliance on distributed storage; single server nodes are autonomous
• time series collection happens via a pull model over HTTP
• pushing time series is supported via an intermediary gateway
• targets are discovered via service discovery or static configuration
• multiple modes of graphing and dashboarding support