metrics: Fix request count metrics names

[fyrchik]

Signed-off-by: Evgenii Stratonikov e.stratonikov@yadro.com

[codecov]

Codecov Report

Merging #2241 (8c4ee50) into support/v0.35 (e3f1804) will increase coverage by 0.10%.
The diff coverage is 64.10%.

❗ Current head 8c4ee50 differs from pull request most recent head 9650e34. Consider uploading reports for the commit 9650e34 to get more accurate results

@@                Coverage Diff                @@
##           support/v0.35    #2241      +/-   ##
=================================================
+ Coverage          30.88%   30.98%   +0.10%     
=================================================
  Files                383      383              
  Lines              28395    28419      +24     
=================================================
+ Hits                8770     8806      +36     
+ Misses             18878    18871       -7     
+ Partials             747      742       -5     

Impacted Files	Coverage Δ
cmd/neofs-node/config.go	0.00% <0.00%> (ø)
pkg/local_object_storage/shard/control.go	76.19% <50.00%> (-0.32%)	⬇️
pkg/local_object_storage/engine/control.go	84.02% <85.18%> (+11.83%)	⬆️
pkg/local_object_storage/engine/range.go	53.33% <0.00%> (-2.23%)	⬇️
pkg/local_object_storage/engine/shards.go	70.50% <0.00%> (+2.87%)	⬆️

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