Add a meta metric about the scrape format

[roidelapluie]

With the same labels as up, I'd like to have a metric called:

scrape_format{name="openmetrics",transport="http",job="node",instance="srv01"} 1

That could ease the migration to openmetrics

[juliusv]

Hmm this would mix target labels and format labels on the same time series, with potential collision resolution required. Maybe a sample value enum instead? Another metric could then define the enum values, if needed.

Or we just add counters for how many endpoints in total were scraped in either format.

[roidelapluie]

actually I would like to see more metrics related to scrape in general, e.g. return code.. it would be metrics like "up"

[brian-brazil]

That's getting a bit into event logging. Keep in mind that any new time series will be added to every single target that exists, which is not free.

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