Normalize Paths to Prevent Cardinality Explosion

[landongrindheim]

🖼️ Context

Our custom metrics usage is currently almost entirely consumed by the high-cardinality values of http.url_details.path, which maps to over 800k values. This change is intended to normalize the paths so that we evaluate paths in a way similar to how the config/routes.rb file defines them.

How It's Used

sidecar_nginx.response_bytes_written accounts for 99.9% of our custom metrics 👇

This metric uses the following configuration, in which you can observe that over the past eight hours there are more than one million values mapped to its tags. 👇

By normalizing the the paths, we will maintain insight into general access patterns while taming our use of custom metrics.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.22%. Comparing base (c3e73f7) to head (66685db).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #5974   +/-   ##
=======================================
  Coverage   97.22%   97.22%           
=======================================
  Files         473      473           
  Lines        9764     9764           
=======================================
  Hits         9493     9493           
  Misses        271      271           

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