build: Add prometheus_client dependency for pip install without container

[rmccorm4]

Overview:

• feat: add SGLang and vLLM passthrough metrics on Dynamo backend worker #3539 added a dependency on prometheus_client to dynamo.common which is automatically imported when trying to run python -m dynamo.frontend
• The dependency was only added to the container dependencies here:

  dynamo/container/deps/requirements.txt

  Line 27 in 237e978

  prometheus_client

• So pip install for local development outside of container was now missing this dependency.
• This PR adds the dependency to the package pyproject.toml so it can't be missed

Details:

Error before this change when following local development pip install steps: https://github.com/ai-dynamo/dynamo?tab=readme-ov-file#developing-locally

Where should the reviewer start?

Related Issues: (use one of the action keywords Closes / Fixes / Resolves / Relates to)

• closes GitHub issue: #xxx

Summary by CodeRabbit

• Chores
  • Added monitoring dependency to project requirements.

[coderabbitai]

Walkthrough

A new dependency, prometheus_client (version >=0.23.1,<1.0), has been added to the project's pyproject.toml file. This is a straightforward configuration update with no changes to application code or public API declarations.

Changes

Cohort / File(s)	Summary
Dependency Addition pyproject.toml	Added prometheus_client>=0.23.1,<1.0 to the dependencies list

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Poem

🐰 A prometheus client joins our crew,
With version bounds to keep things true,
Metrics shall flow, our systems glow,
One line of change—but oh, what show! ✨

Pre-merge checks

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Description Check	⚠️ Warning	The pull request description provides a detailed Overview section that clearly explains the problem, the prior context (PR #3539), and the solution being implemented. However, the description is incomplete according to the required template structure. The "Details" section is entirely blank, the "Where should the reviewer start?" section is empty, and the "Related Issues" section contains only placeholder text ("closes GitHub issue: #xxx") without specifying an actual issue number. While the Overview conveys the essential information about the change, the template requires complete coverage of all specified sections to provide comprehensive guidance to reviewers.	To pass this check, please complete the missing sections in the PR description. Fill in the "Details" section with a concise description of the specific changes (adding prometheus_client>=0.23.1,<1.0 to pyproject.toml dependencies). Add a "Where should the reviewer start?" section pointing to pyproject.toml as the key file to review. Finally, replace the placeholder in "Related Issues" with the actual GitHub issue number that this PR closes, using the appropriate action keyword.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Title Check	✅ Passed	The pull request title "build: Add prometheus_client dependency for pip install without container" is fully aligned with the changeset. It clearly and specifically identifies the main change—adding the prometheus_client dependency to pyproject.toml—and provides important context about why this is needed (to support pip install for local development outside containers). The title is concise, descriptive, and avoids vague language, making it easy for a reviewer scanning commit history to understand the purpose of this change.
Docstring Coverage	✅ Passed	No functions found in the changes. Docstring coverage check skipped.

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[saturley-hall]

Permissive license is a go.