[rabbitmqreceiver] Add node level metrics to receiver

[fagner-koho]

Component(s)

receiver/rabbitmq

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

I use Datadog and AmazonMQ and I flow RabbitMQ metrics to my ecosystem.

The challenge I had is that there is a limit of 500 queues that CloudWatch can monitor. As an alternative for this, I found this receiver.

Although this works for queue metrics there are some metrics that flow from Datadog that don't exist in this receiver.

Describe the solution you'd like

I would like to see the following metrics coming from this receiver:

• aws.amazonmq.rabbit_mqdisk_free
• aws.amazonmq.rabbit_mqfd_used
• aws.amazonmq.rabbit_mqmem_limit
• aws.amazonmq.rabbit_mqmem_used

It seems we should be able to fetch these from node metrics in the /api/nodes endpoint.

Reference

Describe alternatives you've considered

N/A

Additional context

N/A

[github-actions]

Pinging code owners:

• receiver/rabbitmq: @cpheps

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