CPUTotalTime is used to workaround sca issues from gopsutil version upgrades.

ExponentialBuckets produces list like `[start, start * factor, start * factor^2, ..., start * factor^(count-1)]`.

NewRawHistVec creates a new NewRawHistVec based on the provided HistogramOpts and partitioned by the given label names.

StatementCounter accept t as tree.QueryType.

StatementCUCounter accept @account, @sqlSourceType @account is the account name of the user who executes the sql statement.

StatementErrorsCounter accept t as tree.QueryType.

SubSystemMO is the subsystem which show mo internal status.

SubSystemProcess is the subsystem which base on process status.

SubSystemServer is the subsystem which base on server status, trigger by client query.

SubSystemSql is the subsystem which base on query action.

SubSystemSys is the subsystem which base on OS status.

InitCollectors contains all the collectors that belong to SubSystemSql, SubSystemServer, SubSystemProcess and SubSystemStatement.

InternalCollectors contains all the collectors that belong to SubSystemMO.

RawHistVec is a Collector that bundles a set of RawHist that all share the same Desc, but have different values for their variable labels.