chore(observability): remove temporary Sentry rate limiter

app/observability/sentry.py

@@ -4,51 +4,10 @@
 StarletteIntegration can auto-instrument middleware. See app/main.py.
 """
 
-import time
-from collections import deque
-from threading import Lock
-
 import sentry_sdk
-from asyncpg.exceptions import TooManyConnectionsError
 
 from app.config import settings
 
-# Rate-limit pool-exhaustion reports to Sentry. The first N events per
-# window surface normally (storm visibility preserved); beyond that,
-# events drop from Sentry but remain in structlog app logs. Per-process
-# state, so aggregate Sentry volume scales with Cloud Run instance count.
-_POOL_ERR_WINDOW_S = 60.0
-_POOL_ERR_MAX_PER_WINDOW = 5
-_pool_err_times: deque[float] = deque(maxlen=_POOL_ERR_MAX_PER_WINDOW)
-_pool_err_lock = Lock()
-
-
-def _contains_pool_exhaustion(exc: BaseException | None) -> bool:
-    if exc is None:
-        return False
-    if isinstance(exc, TooManyConnectionsError):
-        return True
-    if isinstance(exc, BaseExceptionGroup):
-        return any(_contains_pool_exhaustion(sub) for sub in exc.exceptions)
-    cause = exc.__cause__ if exc.__cause__ is not None else exc.__context__
-    if cause is not None and cause is not exc:
-        return _contains_pool_exhaustion(cause)
-    return False
-
-
-def _rate_limit_pool_exhaustion(event, hint):
-    exc_info = hint.get("exc_info")
-    if not exc_info or not _contains_pool_exhaustion(exc_info[1]):
-        return event
-    now = time.monotonic()
-    with _pool_err_lock:
-        while _pool_err_times and _pool_err_times[0] < now - _POOL_ERR_WINDOW_S:
-            _pool_err_times.popleft()
-        if len(_pool_err_times) >= _POOL_ERR_MAX_PER_WINDOW:
-            return None
-        _pool_err_times.append(now)
-    return event
-
 
 def init_sentry() -> None:
     if not settings.sentry_dsn:
@@ -68,5 +27,4 @@ def init_sentry() -> None:
         profile_session_sample_rate=1.0,
         profile_lifecycle="trace",
         enable_logs=True,
-        before_send=_rate_limit_pool_exhaustion,
     )