Prometheus Metrics storage

[akshay sharma]

Hi All, 

I'm working on Prometheus performance optimization. And simultaneously, I am also going through the prometheus documentation. 

I have a fair understanding of how Prometheus processes data/samples and where it stores the data 

 Although, I have a couple of questions in my mind for which I am seeking answers.

1) Does Prometheus store the metric name every single time it fetches the data? Or does it just store the value/timestamp and soft link/link to the metric name?

ex: testing_prometheus_performace{"label1": "Value1", "label2": "Value2"}    1 1712648163950

so it stores above series all the time or value/timestamp? 

2) Can some fairly long metric names cause a memory issue? If it is storing metrics' names every single time, then will it store metrics' names, labels, values and timestamps? 

[Ben Kochie]

Prometheus uses an inverted index to map names to series.

I highly recommend watching this talk: https://promcon.io/2017-munich/talks/storing-16-bytes-at-scale/

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