# [[Introduction to metrics]] Course:: [[Introduction to the Pillars of Observability]] ## Summary > [!abstract] Summary > Contents ## Log A metric is a numerical measurement. - Can be compared over time - Stored in [[Time-series database|tsdb]]s like: - [[Grafana Mimir]] - [[Prometheus]] - [[InfluxDB]] - [[Graphite]] Grafana Mimir - Open source TSDB designed to be highly scalable - two commercial products: - [[Grafana Enterprise Metrics]] (GEM) - [[Grafana Cloud Metrics]] Labels: key-value pairs that define a data stream Grafana-related products - [[Grafana Enterprise]] - [[Grafana Cloud dashboards]] This is really an introduction to metrics products of Grafana...