MON-2949: add information about Prometheus

content/Projects/Observability/prometheus.md

@@ -1,3 +1,12 @@
 # Prometheus
 
-> In progress.
+Prometheus is a monitoring and alerting system which collects and stores on
+metrics. In the broader sense, it is a collection of tools including (but not
+limited to) Alertmanager, node_exporter, etc.
+
+## Links
+
+* [GitHub project](https://github.com/prometheus/prometheus)
+* [Upstream documentation](https://prometheus.io/docs/)
+* [Community](https://prometheus.io/community/)
+* [Maintainers](https://github.com/prometheus/prometheus/blob/main/MAINTAINERS.md)