Add CockroachDB storage metrics

Adds the following metrics using their DataDog names:

- `storage_wal_fsync_latency`
- `rebalancing_replicas_queriespersecond`
- `range_merges`
- `rebalancing_lease_transfers`
- `rebalancing_range_rebalances`

See also cockroachdb/docs#19425, where these were added to the
CockroachDB docs.

Author: Rich Loveland

cockroachdb_dedicated/metadata.csv

@@ -133,6 +133,7 @@ crdb_dedicated.raft.ticks,count,,unit,,cockroachdb_dedicated,Number of Raft tick
 crdb_dedicated.raftlog.behind,gauge,,unit,,cockroachdb_dedicated,Number of Raft log entries followers on other stores are behind. Shown as entry,0,,
 crdb_dedicated.raftlog.truncated,count,,unit,,cockroachdb_dedicated,Number of Raft log entries truncated. Shown as entry,0,,
 crdb_dedicated.range.adds,count,,unit,,cockroachdb_dedicated,Number of range additions,0,,
+crdb_dedicated.range.merges,count,,unit,,cockroachdb_dedicated,Number of range merges,0,,
 crdb_dedicated.range.raftleadertransfers,count,,unit,,cockroachdb_dedicated,Number of raft leader transfers,0,,
 crdb_dedicated.range.removes,count,,unit,,cockroachdb_dedicated,Number of range removals,0,,
 crdb_dedicated.range.snapshots.generated,count,,unit,,cockroachdb_dedicated,Number of generated snapshots,0,,
@@ -141,6 +142,9 @@ crdb_dedicated.ranges,gauge,,unit,,cockroachdb_dedicated,Number of ranges,0,,
 crdb_dedicated.ranges.overreplicated,gauge,,unit,,cockroachdb_dedicated,Number of ranges with more live replicas than the replication target,0,,
 crdb_dedicated.ranges.unavailable,gauge,,unit,,cockroachdb_dedicated,Number of ranges with fewer live replicas than needed for quorum,0,,
 crdb_dedicated.ranges.underreplicated,gauge,,unit,,cockroachdb_dedicated,Number of ranges with fewer live replicas than the replication target,0,,
+crdb_dedicated.rebalancing.lease.transfers,count,,unit,,cockroachdb_dedicated,Number of lease transfers motivated by store-level load imbalances,0,,
+crdb_dedicated.rebalancing.range.rebalances,count,,unit,,cockroachdb_dedicated,Number of range rebalance operations motivated by store-level load imbalances,0,,
+crdb_dedicated.rebalancing.replicas.queriespersecond,gauge,,unit,,cockroachdb_dedicated,Histogram of average kv-level requests received per second by replicas on the store in the last 30 minutes,0,,
 crdb_dedicated.rebalancing.writespersecond,gauge,,unit,,cockroachdb_dedicated,"Number of keys written i.e. applied by raft per second to the store, averaged over a large time period as used in rebalancing decisions. Shown as key",0,,
 crdb_dedicated.replicas,gauge,,unit,,cockroachdb_dedicated,Number of replicas,0,,
 crdb_dedicated.replicas.leaders,gauge,,unit,,cockroachdb_dedicated,Number of raft leaders,0,,
@@ -165,6 +169,7 @@ crdb_dedicated.rocksdb.num_sstables,gauge,,table,,cockroachdb_dedicated,Number o
 crdb_dedicated.rocksdb.read.amplification,gauge,,read,,cockroachdb_dedicated,Number of disk reads per query. Shown as read,0,,
 crdb_dedicated.rocksdb.table.readers.mem.estimate,gauge,,unit,,cockroachdb_dedicated,Memory used by index and filter blocks,0,,
 crdb_dedicated.round_trip.latency,count,,nanosecond,,cockroachdb_dedicated,Distribution of round-trip latencies with other nodes in nanoseconds. Shown as nanosecond,0,,
+crdb_dedicated.storage.wal.fsync.latency,gauge,,unit,,cockroachdb_dedicated,The write ahead log fsync latency,0,,
 crdb_dedicated.sql.bytesin,count,,byte,,cockroachdb_dedicated,Number of sql bytes received. Shown as byte,0,,
 crdb_dedicated.sql.bytesout,count,,byte,,cockroachdb_dedicated,Number of sql bytes sent. Shown as byte,0,,
 crdb_dedicated.sql.conn.latency,count,,nanosecond,,cockroachdb_dedicated,Latency to establish and authenticate a SQL connection. Shown as nanoseconds.,0,,