Prometheus is an open-source application used for event monitoring and alerting. It records metrics in a time series database (allowing for high dimensionality) built using an HTTP pull model with flexible queries and real-time alerting. The project is written in Go and licensed under the Apache 2 License, with source code available on GitHub.
Rocket.Chat.Metrics repository contains a basic monitoring setup of Rocket.Chat, based on Grafana and Prometheus. It currently shows and visualizes the following application metrics/information:
General totals: Users online/away, DDP users, diffs based on time range.
Metrics: Requests and total size per instance.
NodeJS: Active handles, requests, event loop lag, heap used, per instance heap, garbage collector.
DDP rate limiter: By method, by type, by userId, by connection ID.
Rocket.Chat Data: Messages sent, total sent, user presence, users & sessions, Oplog, push queue, Meteor facts, total users, total rooms, notification per minute per notification type.
Meteor: Methods total time, methods time, method calls per minute.
Subscriptions: Subscription total time, subscription time, subscription calls per minute.
Callbacks & Hooks: Callbacks total time, callbacks time, callback calls per minute, hooks total time, hooks time, hook calls per minute.
REST API: REST total time, REST time, REST calls per minute.
GitHub - RocketChat/Rocket.Chat.Metrics: Monitoring setup for Rocket.Chat servers