Alert fires when Prometheus cannot successfully reload the configuration file due to the file having incorrect content.
Configuration cannot be reloaded and prometheus operates with last known good configuration. Configuration changes in any of Prometheus, Probe, PodMonitor, or ServiceMonitor objects may not be picked up by prometheus server.
Check prometheus container logs for an explanation of which part of the configuration is problematic. Usually this can occur when ServiceMonitors or PodMonitors share the same job label.
Remove conflicting configuration option.