feat: add status metrics for trafficManagerBackend

[zhiying-lin]

What type of PR is this?

/kind feature
add status metrics for trafficManagerBackend

What this PR does / why we need it:

Which issue(s) this PR fixes:

Fixes #

Requirements:

• run make reviewable for basic local test
• Read and followed fleet-networking's Code of conduct.
• uses conventional commit messages
• includes documentation
• adds unit tests

How has this code been tested

added integration tests

https://github.com/Azure/fleet-networking/actions/runs/14514674647 e2e tests passed

Special notes for your reviewer

[kaito-pr-agent]

Title

(Describe updated until commit 54adea7)

Add status metrics for trafficManagerBackend

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Description

• Added status metrics for trafficManagerBackend to monitor its health and state.

• Implemented a custom Prometheus metric to track the last update timestamp of trafficManagerBackend status.

• Updated the integration tests to include validation for the newly added metrics.

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Changes walkthrough 📝

	Relevant files
Enhancement	controller.go Add trafficManagerBackend status metrics                                  pkg/controllers/hub/trafficmanagerbackend/controller.go Registered a custom Prometheus metric for tracking trafficManagerBackend status updates. Added logic to emit the metric based on the current status conditions. Updated the Reconciler to handle the addition of the metrics finalizer. +65/-9
Tests	controller_integration_test.go Update integration tests for trafficManagerBackend metrics pkg/controllers/hub/trafficmanagerbackend/controller_integration_test.go Initialized a custom Prometheus registry for testing metrics. Created functions to validate the emitted metrics against expected values. Updated test cases to include assertions for the new metrics. +420/-41
Dependencies	go.mod Update dependencies                                                                            go.mod Updated dependencies to ensure compatibility with the new Prometheus client library. +19/-22
Additional files	controller.go +3/-3      controller_integration_test.go +1/-0

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PR Reviewer Guide 🔍

(Review updated until commit 54adea7)

Here are some key observations to aid the review process:

⏱️ Estimated effort to review: 3 🔵🔵🔵⚪⚪

🧪 PR contains tests

🔒 No security concerns identified

⚡ Recommended focus areas for review Potential Metric Registration Issue Ensure that the metric registration logic is correctly handling potential errors and edge cases. // Register the custom metrics prometheus.MustRegister(trafficManagerBackendStatusLastTimestampSeconds) } Missing Finalizer Check Verify that the finalizer check logic is comprehensive and covers all necessary scenarios. Expect(k8sClient.Create(ctx, backend)).Should(Succeed()) })

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PR Code Suggestions ✨

Latest suggestions up to c509a3e
Explore these optional code suggestions:

Category	Suggestion	Impact
General	Handle all status conditions in generateMetrics Ensure that the generateMetrics function correctly handles all possible conditions and updates the metrics accordingly. pkg/controllers/hub/trafficmanagerbackend/controller_integration_test.go [906] wantMetrics = append(wantMetrics, generateMetrics(backend, want.Status.Conditions[0])) +wantMetrics = append(wantMetrics, generateMetrics(backend, want.Status.Conditions[1])) // Add additional conditions if necessary Suggestion importance[1-10]: 7 __ Why: The suggestion aims to handle all possible conditions in the generateMetrics function, which is important for comprehensive testing and validation of the traffic manager backend status metrics.	Medium
	Verify the count of emitted metrics Consider adding a check to ensure that the number of expected metrics matches the number of generated metrics. pkg/controllers/hub/trafficmanagerbackend/controller_integration_test.go [917] validateTrafficManagerBackendMetricsEmitted(customRegistry, wantMetrics...) +Expect(len(gotMetrics)).To(Equal(len(wantMetrics)), "Number of emitted metrics does not match expected count") Suggestion importance[1-10]: 6 __ Why: Ensuring the number of emitted metrics matches the expected count helps catch potential issues related to metric generation and collection.	Low

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Previous suggestions

Suggestions up to commit c509a3e

Category	Suggestion	Impact
General	Improve generateMetrics to cover all conditions Ensure that the generateMetrics function correctly handles all possible conditions and generates accurate metrics. pkg/controllers/hub/trafficmanagerbackend/controller_integration_test.go [445] wantMetrics = append(wantMetrics, generateMetrics(backend, want.Status.Conditions[0])) +// Add additional checks for other conditions if necessary Suggestion importance[1-10]: 7 __ Why: Ensuring that the generateMetrics function covers all conditions improves the reliability of the test by providing comprehensive coverage of possible states.	Medium

[codecov]

Codecov Report

Attention: Patch coverage is 73.33333% with 12 lines in your changes missing coverage. Please review.

Project coverage is 80.28%. Comparing base (93a67d4) to head (54adea7).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
...ontrollers/hub/trafficmanagerbackend/controller.go	72.09%	9 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #291      +/-   ##
==========================================
+ Coverage   80.24%   80.28%   +0.04%     
==========================================
  Files          29       29              
  Lines        4065     4099      +34     
==========================================
+ Hits         3262     3291      +29     
- Misses        639      642       +3     
- Partials      164      166       +2     

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PR Code Suggestions ✨

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PR Code Suggestions ✨

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[jwtty]

LGTM