## Problem
The legacy per-service log pages (postgres, auth, api, edge functions,
storage, realtime, cron, etc.) and the single-log detail panel query the
BigQuery-backed `logs.all` analytics endpoint. We are moving these reads
onto the OTEL ClickHouse endpoint (`logs.all.otel`).
## Fix
- Add `Logs.utils.otel.ts`: ClickHouse query builders
(rows/count/chart/single) + row mappers that target the single `logs`
table keyed by `source`, reading fields from the `log_attributes` map
and aliasing columns to the leaf names the renderers expect.
- Parameterize `buildWhereClauses` / `genWhereStatement` in
`Logs.utils.ts` so the OTEL builders reuse the shared nested AND/OR
filter grouping. Defaults keep the BigQuery behavior unchanged.
- Gate `useLogsPreview` (rows, count, chart) and `useSingleLog` (detail)
on the new `otelLegacyLogs` flag. BigQuery stays the default when the
flag is off.
- Extract the OTEL timestamp parser into `parseOtelTimestamp`
(`otel-inspection.utils.ts`) and reuse it in
`unified-logs-infinite-query.ts` (replaces an inline copy of the same
logic; no behavior change).
## Dependencies
None. Standalone, safe to merge on its own. Behind `otelLegacyLogs` (off
by default), so no user-facing change.
Part of DEBUG-145 (split from #47087).
## How to test
- In staging, go to Legacy Logs.
- All logs pages should work the same as before.
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **New Features**
* Added OTEL-backed logs support for preview, count, chart, and
single-log details when enabled.
* **Bug Fixes**
* Improved timestamp parsing/normalization for OTEL data to ensure
correct display and pagination.
* Enhanced filtering behavior, including safer handling of unknown
filter keys and invalid values across OTEL queries.
* Improved single-log result shaping to preserve expected API/database
metadata in OTEL mode.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
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Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
