After the previous migration from [AppEngine logging to Google Cloud Logging](https://github.com/web-platform-tests/wpt.fyi/issues/1747), Cloud Logging in processor needs improvements: - Logs in the processor are not labelled with proper severity, thus very difficult to spot and filter error logs - Logs are not structured, thus difficult to find related logs - Filled with unimportant log entries ,e.g. server health checks