Hi all, I would like to suggest removing the "realm_id" metric tag entirely.
My concern is that this tag has the potential for high cardinality, which is generally considered a bad practice when dealing with metrics. High cardinality can lead to performance issues and increased memory usage. Granted, the default realm resolver in Polaris is tailored for just a handful of realms, but nothing prevents users from declaring hundreds of realms. I believe we can still effectively monitor Polaris servers without this specific tag, since the realm ID is also propagated in traces emitted by Polaris. Tracing is a much better fit for high-cardinality domains. I'm open to discussing this further; a potential alternative would be to introduce a flag to disable this specific metric tag, but I feel like removing it would be a much cleaner approach. Let me know your thoughts. Thanks, Alex
