chore: lightpush - error metric less variable by only setting a fixed string #3020
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Description
Avoid having a too-variable metric by preventing adding the msg_hash on it. In that case, we are just adding a fixed string, not_published_to_any_peer, when the condition "Lightpush request has not been published to any peers" is met.
Thanks for the detailed description @jakubgs 🙌
Issue
bug: absurdly high cardinality of waku_lightpush_errors metrics
closes #3019