After T361399 we've started creating per-page metrics under MediaWiki.rest_api_latency and MediaWiki.rest_api_errors e.g. MediaWiki.rest_api_latency._en.wikipedia.org_v3_page_pagebundle_Athletics_at_the_2024_Summer_Olympics_E2_80_93_Women_27s_5000_metres.GET.200.sample_rate which is obviously not going to work, we should group said metrics into lower cardinality ones.
I'm not 100% sure though the culprit might be https://gerrit.wikimedia.org/r/c/mediawiki/core/+/969811