Instead of relying on `labels.Hash()`, which may change, have the
caller pass in a shard function if required.
For most purposes `tsdb.Options.ShardFunc` is used, but the compactor
may be created independently so `NewLeveledCompactorWithChunkSize` also
takes a shard function parameter.
Regular Prometheus, which does not use block sharding, will have this
parameter as nil.
Signed-off-by: Bryan Boreham <bjboreham@gmail.com>
* Tool for CLI compactions.
* Use concurrency when populating symbols for multiple blocks.
* Use concurrency when writing to multiple output blocks.
Signed-off-by: Peter Štibraný <pstibrany@gmail.com>
