fix: log RST_STREAM/error-code-0 at DEBUG instead of WARNING

CHANGELOG.md

@@ -2,6 +2,11 @@
 
 ## [Unreleased]
 
+### Fixed
+- `RST_STREAM with error code 0` (HTTP/2 `NO_ERROR`, a normal server-side graceful reset) is now logged at `DEBUG` instead of `WARNING` to reduce log noise
+- `CANCELLED` (server closed the stream normally, e.g. keepalive timeout or server rotation) is now logged at `INFO` instead of `WARNING`
+- `UNAUTHENTICATED` reconnects handled by the automatic token refresh are now logged at `INFO` instead of `WARNING`
+
 ## [0.3.0] - 2026-05-12
 
 ### Added

src/quilt_hp/services/streaming.py

@@ -612,7 +612,9 @@ async def _run_stream_with_reconnect(self) -> None:
 
                 if is_unauth and self._authenticate is not None and can_retry:
                     self._stream_state = "reconnecting"
-                    logger.warning(
+                    # Token expiry is handled automatically — INFO to confirm it
+                    # happened without alarming the user.
+                    logger.info(
                         "Stream got UNAUTHENTICATED; refreshing token (attempt %d)",
                         attempt + 1,
                     )
@@ -630,10 +632,25 @@ async def _run_stream_with_reconnect(self) -> None:
                         break
                 elif can_retry:
                     self._stream_state = "reconnecting"
-                    logger.warning(
+                    details = exc.details() or ""
+                    # Classify the error to pick the right log level:
+                    #   DEBUG  — HTTP/2 NO_ERROR RST_STREAM: server gracefully
+                    #            recycled the connection (load balancer, keepalive).
+                    #   INFO   — CANCELLED: server closed the stream normally
+                    #            (keepalive timeout, server rotation, etc.).
+                    #   WARNING — anything else is unexpected.
+                    is_graceful_reset = "RST_STREAM with error code 0" in details
+                    is_server_cancel = exc.code() == grpc.StatusCode.CANCELLED
+                    if is_graceful_reset:
+                        log = logger.debug
+                    elif is_server_cancel:
+                        log = logger.info
+                    else:
+                        log = logger.warning
+                    log(
                         "Stream error %s: %s; reconnecting in %.1fs (attempt %d)",
                         exc.code(),
-                        exc.details(),
+                        details,
                         delay,
                         attempt + 1,
                     )