[v14] fix: trim large events in Athena querier #35483
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Fixes #35161 Large events queried from the Athena audit backend will now be trimmed before they are stored and before they are returned from a query according to the existing TrimToMaxSize implementations for each event type already used by the Dynamo and File backends. The other backends typically trim the event before storing it, for Dynamo this is due to the 400 KB item size limit, for the file backend it's due to the 64 KiB bufio.MaxScanTokenSize. There is no hard limit to events stored in Parquet files in S3, but we've been using a 2 GiB limit in the publisher so far. With this change we will attempt to trim events to 2 GiB before writing them (if we haven't already run out of memory) instead of just failing. We've also been using a 1 MiB limit in the querier and just returning an empty result when an event larger than that is encountered. With this change we will attempt to trim the event to 1MiB before returning it. The 1 MiB limit ultimately stems from the 4MB max gRPC message size. We could just trim to 1 MiB in the publisher, but I'd prefer to preserve as much of the event data as possible in case we improve the querying story for large events in the future (and in case the user wants to query the events directly from S3).
Co-authored-by: rosstimothy <39066650+rosstimothy@users.noreply.github.com>
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Backport #35402 to branch/v14
changelog: fix querying of large audit events with Athena backend