FormatShardIDLabelValue expects 0-based shardID, but uses 1-based shard in the output string.

ParseShardIDLabelValue returns original (0-based) shard index and shard count parsed from formatted value.

RemoveShardFromMatchers returns the input matchers without the label matcher on the query shard (if any).

ShardFromMatchers extracts a ShardSelector and the index it was pulled from the matcher list.

CompactorShardIDLabel is the external label used to store the ID of a sharded block generated by the split-and-merge compactor.

ShardLabel is a reserved label referencing a shard on read path.

ShardSelector holds information about the configured query shard.