[9.4] [Obs AI Assistant] Skip log rate analysis and log categories when no entity filters are present (#290244) - #290485
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…entity filters are present (elastic#290244) Closes Issue: elastic/sdh-kibana#6510 ## Summary Fixes a performance issue where clicking "Help me understand this alert" on a `custom_threshold` alert that monitors a non-standard metric, one that produces no `service.name`, `host.name`, `container.id`, or `kubernetes.pod.name` in the alert document, causes the `/internal/observability/assistant/alert_details_contextual_insights` endpoint to hang indefinitely. ### Root cause `getLogRateAnalysisForAlert` and `getLogCategories` were pushed to the data-fetcher queue unconditionally, regardless of whether any entity context was available. When all entity values are `undefined`, `getShouldMatchOrNotExistFilter` returns an empty array, so the resulting ES queries carry no entity-scoping filters and fan out across **all** configured log sources. ### Fix Added a `hasEntityFilters` flag (true when at least one of `serviceName`, `hostName`, `containerId`, `kubernetesPodName` is defined) and wrapped both log data fetchers with `if (hasEntityFilters)`. When no entity context is present, running these analyses has no meaningful scope and would scan all log data without correlation to the triggering alert. (cherry picked from commit 3843732)
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