ClickHouse/dbms/src/Common/CurrentMetrics.cpp

#include <DB/Common/CurrentMetrics.h>


/// Available metrics. Add something here as you wish.
#define APPLY_FOR_METRICS(M) \
	M(Query) \
	M(Merge) \
	M(ReplicatedFetch) \
	M(ReplicatedSend) \
	M(ReplicatedChecks) \
	M(BackgroundPoolTask) \
	M(DiskSpaceReservedForMerge) \
	M(DistributedSend) \
	M(QueryPreempted) \
	M(TCPConnection) \
	M(HTTPConnection) \
	M(InterserverConnection) \
	M(OpenFileForRead) \
	M(OpenFileForWrite) \
	M(Read) \
	M(Write) \
	M(SendExternalTables) \
	M(QueryThread) \
	M(ReadonlyReplica) \
	M(LeaderReplica) \
	M(MemoryTracking) \
	M(LeaderElection) \
	M(EphemeralNode) \
	M(ZooKeeperWatch) \
	M(DelayedInserts) \
	M(ContextLockWait) \


namespace CurrentMetrics
{
	#define M(NAME) extern const Metric NAME = __COUNTER__;
		APPLY_FOR_METRICS(M)
	#undef M
	constexpr Metric END = __COUNTER__;

	std::atomic<Value> values[END] {};	/// Global variable, initialized by zeros.

	const char * getDescription(Metric event)
	{
		static const char * descriptions[] =
		{
		#define M(NAME) #NAME,
			APPLY_FOR_METRICS(M)
		#undef M
		};

		return descriptions[event];
	}

	Metric end() { return END; }
}

#undef APPLY_FOR_METRICS