blockhain rpc limits

[0xdeafbeef]

Reduce boilerplate for metrics

[codecov]

Codecov Report

Attention: Patch coverage is 61.90476% with 8 lines in your changes missing coverage. Please review.

Project coverage is 42.87%. Comparing base (28c8444) to head (12c7958).

Files with missing lines	Patch %	Lines
core/src/blockchain_rpc/service/mod.rs	50.00%	6 Missing ⚠️
core/src/blockchain_rpc/service/util.rs	77.77%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #605   +/-   ##
=======================================
  Coverage   42.87%   42.87%           
=======================================
  Files         278      279    +1     
  Lines       51882    51854   -28     
  Branches    51882    51854   -28     
=======================================
- Hits        22243    22234    -9     
+ Misses      28477    28458   -19     
  Partials     1162     1162           

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