What do you monitor in MongoDb and what tools do you use?

Question

MongoDB

Hello.
Your monitoring experience is interesting - what and with what tools do you track in the database?
For example, there is a plugin for Grafana Enterprise that can work with find/aggregate in mongo. You can display beautiful dashboards on the growth of documents and any other count() in collections.
Monga itself also has such a tool for "iron" monitoring.
In general, I will be glad to any comments on the topic.

Answer 1

There are thousands of monitorings of all sorts, each with its own pros/cons. For example, you can have a central monitoring node, you can use Prometheus for this, which will go to the specified addresses and pick up metrics (for this, you will need to put agents on the target nodes that will give these same metrics).
What to monitor:
- that the instance with mongo is alive
- that replication is alive
For prometheus, there is a good website with a selection of all sorts of different rules, including for mongo: https://awesome-prometheus-alerts.grep.to/rules#mongodb