Unexplained recording rule syntax example provided in docs

[cmcginty]

I'm raising this issue because the current Recording Rule documentation is woefully lacking with respect to non-expert user such as myself.

I'm trying to implement a recording rule but the first example is using syntax that is not defined nor explained to the reader.

On the https://prometheus.io/docs/querying/rules/#configuring-rules page, the example is:

# Saving the per-job HTTP in-progress request count as a new set of time series:
job:http_inprogress_requests:sum = sum(http_inprogress_requests) by (job)

First, the left-hand value does not match the syntax defined immediately above it. Assuming the example is valid, could you please document the <X>:<Y>:<Z>values with respect to the right-hand query in the example?

Does the colon in this example have some special meaning?

[brian-brazil]

That's a convention defined in https://prometheus.io/docs/practices/rules/, and it does match the docs prior to it.

[lock]

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