M(SelectedRanges, "Number of (non-adjacent) ranges in all data parts selected to read from a MergeTree table.") \
M(SelectedMarks, "Number of marks (index granules) selected to read from a MergeTree table.") \
\
M(Merge, "Number of launches background merges.") \
M(Merge, "Number of launched background merges.") \
M(MergedRows, "Rows read for background merges. This is the number of rows before merge.") \
M(MergedUncompressedBytes, "Uncompressed bytes (for columns as they stored in memory) that was read for background merges. This is the number before merge.") \
M(MergesTimeMilliseconds, "Total time spent for background merges.")\
