Only log all ClientConnectionResets when returning logs (#5715)

* Suppress all ClientConnectionReset when returning logs

In #5358 we started suppressing ClientConnectionReset when logs are
returned from the Journal Gateway and the client ends connection
unexpectedly. The connection can be closed also when the headers are
returned, so ignore also that error.

Refs #5606

* Log ClientConnectionResetError as DEBUG instead of suppressing it

Author: sairon

supervisor/api/host.py

@@ -255,16 +255,21 @@ async def advanced_logs_handler(
                 response.content_type = CONTENT_TYPE_TEXT
                 headers_returned = False
                 async for cursor, line in journal_logs_reader(resp, log_formatter):
-                    if not headers_returned:
-                        if cursor:
-                            response.headers["X-First-Cursor"] = cursor
-                        response.headers["X-Accel-Buffering"] = "no"
-                        await response.prepare(request)
-                        headers_returned = True
-                    # When client closes the connection while reading busy logs, we
-                    # sometimes get this exception. It should be safe to ignore it.
-                    with suppress(ClientConnectionResetError):
+                    try:
+                        if not headers_returned:
+                            if cursor:
+                                response.headers["X-First-Cursor"] = cursor
+                            response.headers["X-Accel-Buffering"] = "no"
+                            await response.prepare(request)
+                            headers_returned = True
                         await response.write(line.encode("utf-8") + b"\n")
+                    except ClientConnectionResetError as err:
+                        # When client closes the connection while reading busy logs, we
+                        # sometimes get this exception. It should be safe to ignore it.
+                        _LOGGER.debug(
+                            "ClientConnectionResetError raised when returning journal logs: %s",
+                            err,
+                        )
             except ConnectionResetError as ex:
                 raise APIError(
                     "Connection reset when trying to fetch data from systemd-journald."