[receiver/mongodbatlas] Add additional collected metrics

[StefanKurek]

Component(s)

receiver/mongodbatlas

Is your feature request related to a problem? Please describe.

There are a number of metrics available that are useful (and that may already be collected from the API as far as I can tell), but not currently being made into metrics. Adding these metrics would help to have parity with the monitoring graphs that MongoDB Atlas has to offer natively.

The list is:

• mongodbatlas.process.cache.ratio
• mongodbatlas.disk.partition.throughput
• mongodbatlas.disk.partition.queue.depth

Metrics for the count of databases & the counts that mongodbatlas.db.counts currently provides but at the Cluster resource level (vs the current Processor/Database level) could also be useful, but I'm not sure how well these would fit within the current pattern for this receiver.

Describe the solution you'd like

1. Add new metrics:
   mongodbatlas.process.cache.ratio to be placed under a Processor resource.

mongodbatlas.disk.partition.throughput
mongodbatlas.disk.partition.queue.depth to be placed under a Processor/Disk resource.

2. If I can think of an unobtrusive way, add an aggregate way to show mongodbatlas.db.counts for the entire Cluster as well as a mongodbatlas.db.count type metric which would show the count of databases for the Cluster.

Describe alternatives you've considered

No response

Additional context

No response

[github-actions]

Pinging code owners:

• receiver/mongodbatlas: @djaglowski @schmikei

See Adding Labels via Comments if you do not have permissions to add labels yourself.