Add domain_type and cluster_groups tags

[vytautas-karpavicius]

What changed?

• Added domain_type tag to emit whether domain is global or local when emitting active_cluster gauge.
• Added cluster_group tag to indicate which cluster group this is. It is a sorted and concatenated string of enabled clusters in the group.

Why?
With this addition it will be possible to detect whether global domain is active in several clusters and alert on that.

How did you test it?

Potential risks

Release notes

Documentation Changes

[coveralls]

Pull Request Test Coverage Report for Build 01831b95-9463-4eee-8ce6-535834f67557

• 24 of 24 (100.0%) changed or added relevant lines in 4 files are covered.
• 159 unchanged lines in 14 files lost coverage.
• Overall coverage decreased (-0.02%) to 57.31%

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Files with Coverage Reduction	New Missed Lines	%
service/history/queue/timer_queue_processor_base.go	1	77.26%
common/persistence/historyManager.go	2	66.67%
common/persistence/persistenceMetricClients.go	2	56.86%
service/history/task/transfer_active_task_executor.go	2	72.13%
service/matching/matcher.go	2	91.46%
common/persistence/statsComputer.go	3	94.64%
common/persistence/serialization/parser.go	4	65.41%
common/persistence/serialization/thrift_decoder.go	4	61.22%
common/persistence/nosql/nosqlplugin/cassandra/workflow.go	6	59.55%
common/persistence/sql/workflowStateMaps.go	12	85.34%

Totals
Change from base Build 01831387-3382-4d09-8153-bf4c32fdd209:	-0.02%
Covered Lines:	85146
Relevant Lines:	148570

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💛 - Coveralls