Does the order of labels matter?

[Andrii Babanin]

Hi

I'm working on a proprietary metrics framework that exposes the metrics page for Prometheus to scrape from.

I wonder if will it affect the Prometheus server if I change the order of labels. For instance,

In framework v1 I expose metrics with unordered labels:

test_counter{instance="test:80",error="false",app_name="TestApp"}

In framework v2 labels are lexicographically  sorted:

test_counter{app_name="TestApp",error="false",instance="test:80"}


Does the order of metrics important? 

Will Prometheus be able to continue scraping my metric endpoint with no issues?

TIA

[Ben Kochie]

No, the order of labels doesn't matter. Either at ingestion time or at query time.

Note that `instance` is a reserved label name for Prometheus. Prometheus injects the `instance` label for you, the app does not need to know anything about instance or other deployment topology information. This is handled by service discovery.

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