Fix Prometheus node/cluster labels #4629

Job	Run time
Format check	18s
Lint check	1m 8s
Lint javascript	22s
Lint OpenAPI	17s
Spec	2m 26s
Compile LavinMQ	1m 7s
Spec FreeBSD	2m 21s
Filters for frontend specs	4s
Spec OS X	2m 18s
RabbitMQ java client test	5m 45s
Bunny client test	2m 27s
RabbitMQ HTTP API Ruby client test	51s
RabbitMQ HTTP API Go client test	1m 2s
Test in release mode	42s
Frontend specs	0s
	21m 8s

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