feat: add status metris for trafficManagerProfile

[zhiying-lin]

What type of PR is this?

/kind feature

add status metrics,

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
e2e tests are green, https://github.com/Azure/fleet-networking/actions/runs/14467440679

Special notes for your reviewer

[kaito-pr-agent]

Title

(Describe updated until commit 626bb4f)

Add status metrics for TrafficManagerProfile

---

Description

• Added status metrics for TrafficManagerProfile to monitor the last update timestamp.

• Registered a custom Prometheus metric for tracking the status of TrafficManagerProfile.

• Updated the controller to manage the new MetricsFinalizer.

• Enhanced the integration tests to validate the emission of the new metrics.

---

Changes walkthrough 📝

	Relevant files
Enhancement	objectmeta.go Add MetricsFinalizer and initialize Prometheus metrics      pkg/common/objectmeta/objectmeta.go Added MetricsFinalizer constant. Initialized custom Prometheus metrics. +3/-0      controller.go Manage MetricsFinalizer and emit status metrics                    pkg/controllers/hub/trafficmanagerprofile/controller.go Registered the custom Prometheus metrics. Managed the MetricsFinalizer in the reconciliation loop. Emitted the traffic manager profile status metric. +69/-13  controller_integration_test.go Initialize custom registry and validate metrics emission  pkg/controllers/hub/trafficmanagerprofile/controller_integration_test.go Initialized a custom Prometheus registry for testing. Validated the emission of the traffic manager profile status metrics. +213/-9  metrics.go Create metrics utility package                                                      test/common/metrics/metrics.go Created a utility package for testing Prometheus metrics. +29/-0
Refactoring	profile.go Sort slices in comparison options                                                test/common/trafficmanager/validator/profile.go Sorted slices in comparison options for better test stability. +3/-0

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[kaito-pr-agent]

PR Reviewer Guide 🔍

(Review updated until commit 626bb4f)

Here are some key observations to aid the review process:

⏱️ Estimated effort to review: 4 🔵🔵🔵🔵⚪

🧪 PR contains tests

🔒 No security concerns identified

⚡ Recommended focus areas for review Potential Race Condition The emitTrafficManagerProfileStatusMetric function is called within a deferred function, but it doesn't guarantee that the metric will be emitted before the function returns. This could lead to race conditions where the metric is not yet emitted when the function exits. // TODO: replace the following with defaulter wehbook Missing Error Handling The emitTrafficManagerProfileStatusMetric function calls meta.FindStatusCondition, but it doesn't check if the condition is nil before accessing its fields. This could cause a panic if the condition is nil. cond := meta.FindStatusCondition(profile.Status.Conditions, string(fleetnetv1beta1.TrafficManagerProfileConditionProgrammed)) if cond != nil && cond.ObservedGeneration == generation {

[kaito-pr-agent]

PR Code Suggestions ✨

Latest suggestions up to 626bb4f

Explore these optional code suggestions:

Category	Suggestion	Impact
General	Rename finalizer to avoid conflicts Ensure uniqueness of finalizer names to avoid conflicts. pkg/common/objectmeta/objectmeta.go [37] -MetricsFinalizer = fleetNetworkingPrefix + "metrics-cleanup" +MetricsFinalizer = fleetNetworkingPrefix + "traffic-manager-metrics-cleanup" Suggestion importance[1-10]: 7 __ Why: The suggestion ensures uniqueness of finalizer names, which helps avoid conflicts with other controllers or extensions using similar finalizers.	Medium

---

Previous suggestions

Suggestions up to commit 777bb9d

Category	Suggestion	Impact
General	Handle potential errors during metric emission Ensure the metric emission logic handles potential errors gracefully. pkg/controllers/hub/trafficmanagerprofile/controller.go [125] -defer emitTrafficManagerProfileStatusMetric(profile) +defer func() { + if err := emitTrafficManagerProfileStatusMetric(profile); err != nil { + klog.ErrorS(err, "Failed to emit traffic manager profile status metric", "trafficManagerProfile", profileKRef) + } +}() Suggestion importance[1-10]: 7 __ Why: The suggestion improves the robustness of the code by adding error handling for the metric emission logic, which is important for maintaining the reliability of the application.	Medium

Suggestions up to commit 777bb9d

Category	Suggestion	Impact
General	Add conditional check for status conditions before emitting metrics Ensure the metric emission logic handles cases where the profile status might not have changed. pkg/controllers/hub/trafficmanagerprofile/controller.go [125] -defer emitTrafficManagerProfileStatusMetric(profile) +defer func() { + if len(profile.Status.Conditions) > 0 { + emitTrafficManagerProfileStatusMetric(profile) + } +}() Suggestion importance[1-10]: 7 __ Why: This suggestion ensures that the metric emission logic only runs if there are status conditions present, preventing unnecessary metric emissions when the profile status hasn't changed.	Medium

[codecov]

Codecov Report

Attention: Patch coverage is 71.73913% with 13 lines in your changes missing coverage. Please review.

Project coverage is 80.49%. Comparing base (677e344) to head (626bb4f).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...ontrollers/hub/trafficmanagerprofile/controller.go	71.73%	10 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #288      +/-   ##
==========================================
+ Coverage   80.30%   80.49%   +0.18%     
==========================================
  Files          29       29              
  Lines        4032     4065      +33     
==========================================
+ Hits         3238     3272      +34     
+ Misses        630      629       -1     
  Partials      164      164              

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