feat(api): Tag view.response metrics with ApiOwner when available

[jasonyuezhang]

This allows teams to more easily dashboard and alert on API metrics for the APIs they own.

Impact on cardinality shouldn't be too bad; the set of teams is relatively small, and they should be really strongly correlated with url_name.

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Copied from getsentry#102116
Original PR: getsentry#102116

[propel-test-bot]

Add API owner tag to view.response metric

Adds owner attribution to the view.response counter emitted by RequestTimingMiddleware. The middleware now introspects request.resolver_match.func.cls.owner (when present) and records the owner's enum .value. Test suite extended to cover default, rate-limited, UI, and owner-aware scenarios.

Key Changes

• Updated src/sentry/middleware/stats.py to derive owner tag from Endpoint classes
• Extended tests/sentry/middleware/test_stats.py with new OwnedEndpoint and three additional assertions to validate owner tagging
• Default owner falls back to "unknown" / "unowned" to keep tags consistent when no owner is declared

Affected Areas

• RequestTimingMiddleware._record_time
• Unit tests for middleware metrics

This summary was automatically generated by @propel-code-bot

[propel-test-bot]

[BestPractice]

Owner extraction logic is missing error handling. If view_class.owner exists but owner_enum.value throws an AttributeError (e.g., if owner isn't an enum), this will cause a runtime exception:

if owner_enum is not None:
    try:
        owner = owner_enum.value
    except AttributeError:
        owner = str(owner_enum)  # Fallback for non-enum values

Context for Agents

[**BestPractice**]

Owner extraction logic is missing error handling. If `view_class.owner` exists but `owner_enum.value` throws an AttributeError (e.g., if `owner` isn't an enum), this will cause a runtime exception:

```python
if owner_enum is not None:
    try:
        owner = owner_enum.value
    except AttributeError:
        owner = str(owner_enum)  # Fallback for non-enum values
```

File: src/sentry/middleware/stats.py
Line: 79