Add GraphiteDB tags formatter

[tuyndoan]

Add GraphiteDB Tags Formatter

Description

Add support for GraphiteDB tags formatting in StatsD metrics. The new formatter allows tags to be placed right after the bucket name using GraphiteDB's specific format: ;tag1=value1;tag2;tag3=value3.

Changes

• Add new GraphiteDbTagsFormatter class implementing StatsD tags formatting for GraphiteDB
• Add corresponding unit tests to validate the formatter behavior
• The formatter uses the following configuration:
  • Prefix: ";"
  • No suffix
  • Tags are placed immediately after metric name (non-trailing)
  • Tags separator: ";"
  • Key-value separator: "="

Example Outputs

# Counter with tags
prefix.bucket;foo=bar;empty;lorem=ipsum:128|c

# Timing with tags and sampling rate
prefix.bucket;foo=bar;empty;lorem=ipsum:128|ms|@0.5

# Gauge with floating point value
prefix.bucket;foo=bar;empty;lorem=ipsum:128.5|g

[martincostello]

Could you bump the version to 5.1.0 please?

JustEat.StatsD/version.props

Line 4 in 361a3c9

<VersionPrefix>5.0.2</VersionPrefix>

Otherwise this looks good - thanks for the contribution!

[martincostello]

This highlights that we should have probably made these singletons via { get; } = ... rather than creating a new instance on every access.

I'll fix that in a separate PR after this is merged.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.06%. Comparing base (ec72d82) to head (441588f).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #818      +/-   ##
==========================================
+ Coverage   83.82%   84.06%   +0.23%     
==========================================
  Files          28       29       +1     
  Lines         674      684      +10     
  Branches      151      151              
==========================================
+ Hits          565      575      +10     
  Misses         67       67              
  Partials       42       42              

Flag	Coverage Δ
linux	83.04% <100.00%> (-0.35%)	⬇️
macos	83.33% <100.00%> (+0.24%)	⬆️
windows	83.47% <100.00%> (+0.24%)	⬆️

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[martincostello]

Thanks again for your contribution @tuyndoan - your changes are available in JustEat.StatsD v5.1.0 📦 which is now available from NuGet.org 🙇