[2.2.0] Checkmk Werk 16799 created: Custom & forecast graphs: More descriptive error messages in case of missing user input when configuring metrics

Title: Custom & forecast graphs: More descriptive error messages in case of missing user input when configuring metrics Class: fix Compatible: compat Component: metrics Date: 1713524269 Edition: cee Level: 1 Version: 2.2.0p26 When configuring the metrics rendered in custom and forecast graphs, users have to select a host, a service and a metric. Previously, if any of these fields were missing, the Checkmk UI displayed the message "Cannot calculate graph recipes" and an uninformative traceback. As of this werk, the UI instead displays a descriptive error message.