Features
* expose metrics via uvicorn webserver
* makes all uvicorn configuration options possible
* add security best practices to server configuration
* add following metrics to `http_input` connector
* `nummer_of_http_requests`
* `message_backlog_size`
Bugfix
* fixes a bug in grokker rules, where common field prefixes wasn't possible
* fixes bug where missing key in credentials file leads to AttributeError