Is it safe to use the same stat_prefix or alt_stat_name?

[I Gusti Ngurah Putra Sattvika]

Hi,

I'm running Envoy with some listeners and clusters which metrics I don't want to be exported (or scraped by Prometheus). My original approach was to use stats_matcher but decided against it after reading the warning in the documentation as well as issue #8771.

The approach I'm currently considering is to use the same stat_prefix and alt_stat_name values (e.g. "__drop_me__") for all listeners and clusters which metrics I don't want, which then can be dropped by Prometheus during metrics scraping with metric_relabel_configs.

However, I'm not sure how safe this approach is. Using the same stat_prefix or alt_stat_name seems to "combine" the statistics from multiple distinct resources so I'm concerned it may also affect code paths that depend on stat values like those described in #8771.


Thanks,
Putra Sattvika

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