blockhain rpc limits

[0xdeafbeef]

Reduce boilerplate for metrics

[codecov]

Codecov Report

Attention: Patch coverage is 60.26786% with 178 lines in your changes missing coverage. Please review.

Project coverage is 45.59%. Comparing base (7801e59) to head (3726738).
Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
core/src/blockchain_rpc/service/handlers.rs	46.45%	130 Missing and 6 partials ⚠️
core/src/blockchain_rpc/service/mod.rs	80.00%	30 Missing and 1 partial ⚠️
util/src/metrics/histogram_guard.rs	70.00%	8 Missing and 1 partial ⚠️
core/src/blockchain_rpc/service/util.rs	77.77%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #605      +/-   ##
==========================================
- Coverage   45.59%   45.59%   -0.01%     
==========================================
  Files         280      282       +2     
  Lines       52940    52987      +47     
  Branches    52940    52987      +47     
==========================================
+ Hits        24137    24158      +21     
- Misses      27588    27611      +23     
- Partials     1215     1218       +3     

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