rabbitmqctl node_health_check and its HTTP API counterpart are DEPRECATED

[Anthony Mastrean]

It seems like running the Stage 6 health check, directly from the docs, returns the deprecation warning for the previous health check command. Is this intentional? Is it actually `node_health_check` that's deprecated, no matter how you run it?

rabbitmq-diagnostics -q node_health_check 

https://www.rabbitmq.com/monitoring.html#health-checks  

The warning, for reference:

[warning] <0.904.0> rabbitmqctl node_health_check and its HTTP API counterpart are DEPRECATED.

[Michael Klishin]

This is intentional. See [1][2] for a list of modern health checks.

As of 3.8.10, they will be exposed as HTTP API endpoints as well.

1. https://www.rabbitmq.com/monitoring.html#health-checks

2. rabbitmq-diagnostics help

[Michael Klishin]

I have removed stage 6 from the docs (yet to go live). In an environment with a fairly small (say, a few 100s)

queues and connections you can achieve something similar by enabling per-object metric reporting [1]

and configuring an alert on certain per-object metrics (which metric and threshold you pick is up to you).

1. https://www.rabbitmq.com/prometheus.html#metric-aggregation

[Anthony Mastrean]

Thank you!