Add Datadog metric support and --version CLI flag Datadog Support: - Add Datadog and DogStatsD to METRIC_RECEIVERS - Properly differentiate factory-pattern (Prometheus) vs direct-action (StatsD/Datadog) clients - Support Datadog.increment, Datadog.gauge, Datadog.timing, etc. - Add distribution method support for histograms CLI --version flag: - Add --version option to print version and exit - Update help text to include --version Tests: - Add tests for Datadog.increment, DogStatsD.increment - Add tests for Datadog.gauge, Datadog.timing - Add tests for --version flag Documentation: - Update README with Datadog/DogStatsD in metrics table - Add --version to CLI options Co-authored-by: r.buddie <r.buddie@gmail.com>

[rossme]

Note

Adds support for Datadog/DogStatsD metrics and a version-printing CLI flag.

• Extend metric parsing to recognize Datadog/DogStatsD direct-action methods (increment, gauge, timing, etc.); add receivers and action lists, and map distribution to histogram
• Differentiate Prometheus factory pattern vs direct-action clients in Visitor for accurate metric detection
• Add --version to CLI: validate option, print diffdash <VERSION>, and update help text
• Update README to document Datadog/DogStatsD and --version
• Add specs covering Datadog/DogStatsD calls and --version behavior

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