feat: add ability to ship k3s container logs via vector

If a global vector-sink property on the logs plugin is set, we will use that to configure a log sink (defaulting to console output otherwise). Note that the actual configuration still needs to be a valid DSN representing a Vector log sink.

While this does not support pinning log sinks to specific apps, it opens up integration for those who use a single k3s cluster in shared tenancy.

plugins/logs/set.go

@@ -49,7 +49,7 @@ func validateVectorSink(appName string, value string) error {
 		return nil
 	}
 
-	_, err := sinkValueToConfig(appName, value)
+	_, err := SinkValueToConfig(appName, value)
 	if err != nil {
 		return err
 	}