[metrics] fix metric name and use type as label.

[jolestar]

No description provided.

[codecov]

Codecov Report

Merging #2984 (43dc06c) into master (094a713) will increase coverage by 0.44%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #2984      +/-   ##
==========================================
+ Coverage   33.29%   33.72%   +0.44%     
==========================================
  Files         515      515              
  Lines       45688    45688              
  Branches    20830    20830              
==========================================
+ Hits        15206    15405     +199     
+ Misses      16047    16043       -4     
+ Partials    14435    14240     -195     

Flag	Coverage Δ
unittests	33.72% <0.00%> (+0.44%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
block-relayer/src/metrics.rs	41.38% <ø> (+6.90%)	⬆️
txpool/src/lib.rs	46.22% <ø> (ø)
txpool/src/metrics.rs	36.00% <ø> (ø)
txpool/src/test.rs	15.67% <0.00%> (ø)
txpool/src/tx_pool_service_impl.rs	47.09% <ø> (ø)
commons/crypto/src/multi_ed25519/mod.rs	71.43% <0.00%> (-14.28%)	⬇️
vm/functional-tests/src/genesis_accounts.rs	37.50% <0.00%> (-12.50%)	⬇️
network-rpc/core/src/lib.rs	23.53% <0.00%> (-5.88%)	⬇️
network/src/worker.rs	45.17% <0.00%> (-4.83%)	⬇️
commons/crypto/src/multi_ed25519/multi_shard.rs	44.45% <0.00%> (-4.23%)	⬇️
... and 81 more

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