prometheus.py: add pool_name and image_name to subsystem_namespace_metadata #3070

Job	Run time
build-arm64	1h 1m 6s
build-ceph	1m 47s
build	9m 5s
demo (unsecured)	4m 11s
demo (psk)	5m 37s
atom	36m 0s
demo (dhchap)	5m 22s
discovery (container)	4m 11s
ha (sanity)	3m 50s
discovery (embedded)	3m 47s
ha (no_huge)	4m 1s
pytest (cli)	3m 32s
ha (ns_lb_change)	3m 52s
ha (no_subsystems)	2m 44s
ha (auto_load_balance)	20m 35s
pytest (cli_change_lb)	8m 5s
ha (state_transitions)	5m 13s
ha (state_transitions_both_gws)	6m 23s
pytest (cli_change_keys)	3m 14s
ha (state_transitions_loop)	21m 13s
pytest (state)	2m 39s
pytest (multi_gateway)	2m 34s
ha (state_transitions_rand_loop)	27m 11s
ha (late_registration)	4m 0s
ha (late_registration_loop)	9m 20s
pytest (server)	3m 30s
ha (4gws)	8m 54s
pytest (grpc)	3m 16s
ha (4gws_loop)	11m 4s
pytest (omap_lock)	3m 42s
ha (4gws_create_delete)	10m 29s
pytest (log_files)	3m 36s
ha (4gws_create_delete_loop)	14m 24s
pytest (nsid)	3m 24s
ha (namespaces)	11m 53s
pytest (psk)	2m 28s
ha (namespaces_loop)	22m 22s
pytest (dhchap)	2m 27s
ha (mtls)	3m 33s
ha (notify)	2m 6s
ha (ceph_status)	2m 11s
ha (blocklist)	2m 45s
ha (main_exit)	1m 57s
push-devel-image-to-ceph-registry	0s
push-images-to-ceph-registry	0s
	6h 13m 33s

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