Proposal: Canton Observability Standard (COS)

Development Fund Proposal Submission

Proposal file: proposals/canton-observability-standard.md

Summary: This PR adds the Canton Observability Standard (COS) proposal — a community specification and reference implementation defining canonical metric names, trace span conventions, and production-grade alert rules for Canton node and application deployments.

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Checklist

• [x] I have read the contribution guidelines
• [x] The proposal follows the template structure in proposals/_template.md
• [x] I have included a clear abstract, specification, milestones, and funding breakdown
• [x] The proposal includes adoption-based milestones with verifiable acceptance criteria

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Notes for Reviewers

• Label suggestion: node-deployment-operations (consistent with PR #126 and #127, which are also operational infrastructure proposals). Label can only be applied by maintainers.
• Authors: blackthornlover <h@bitdynamics.me>, Zhe Li <zhe@bitdynamics.me>, Srikanth <srikanth@bitdynamics.me>
• Implementing Entity: Bitdynamics
• Total funding requested: 1,600,000 CC across 4 adoption-based milestones