use separate metrics per volume

[davies]

No description provided.

[codecov-commenter]

Codecov Report

Merging #2253 (8d8939c) into main (16adb08) will increase coverage by 0.18%.
The diff coverage is 91.38%.

@@            Coverage Diff             @@
##             main    #2253      +/-   ##
==========================================
+ Coverage   61.77%   61.95%   +0.18%     
==========================================
  Files         138      137       -1     
  Lines       25052    25184     +132     
==========================================
+ Hits        15477    15604     +127     
- Misses       7771     7775       +4     
- Partials     1804     1805       +1     

Impacted Files	Coverage Δ
cmd/mdtest.go	28.48% <0.00%> (-0.18%)	⬇️
pkg/meta/interface.go	54.92% <ø> (-0.63%)	⬇️
pkg/metric/metrics.go	22.72% <ø> (-9.28%)	⬇️
cmd/gateway.go	86.25% <75.00%> (-1.15%)	⬇️
pkg/chunk/mem_cache.go	86.20% <80.00%> (-2.53%)	⬇️
pkg/meta/sql.go	65.88% <80.00%> (-0.02%)	⬇️
pkg/chunk/cached_store.go	77.39% <93.05%> (+1.01%)	⬆️
pkg/meta/base.go	71.44% <96.15%> (+1.41%)	⬆️
pkg/chunk/disk_cache.go	81.63% <98.14%> (+1.68%)	⬆️
cmd/mount.go	61.95% <100.00%> (ø)
... and 11 more

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