backport: apisix ingress pr #2480 #2473 #2492

[ronething]

Type of change:

• Bugfix
• New feature provided
• Improve performance
• Backport patches
• Documentation
• Refactor
• Chore
• CI/CD or Tests

What this PR does / why we need it:

backport #2480 #2473 #2492 from apisix-ingress-controller repo.

• feat: support custom metrics apache/apisix-ingress-controller#2480
• chore: update status only when changes occur apache/apisix-ingress-controller#2473
• chore: differentiate the API versions for CRD testing apache/apisix-ingress-controller#2492

Pre-submission checklist:

• Did you explain what problem does this PR solve? Or what new features have been added?
• Have you added corresponding test cases?
• Have you modified the corresponding document?
• Is this PR backward compatible? If it is not backward compatible, please discuss on the mailing list first

[Copilot]

Pull Request Overview

This PR adds custom metrics support to the APISIX Ingress Controller, implementing Prometheus-style metrics for monitoring ADC sync operations, file I/O performance, and status update queue management. Additionally, it upgrades the Go version from 1.22 to 1.23 across the project.

• Implements comprehensive Prometheus metrics for ADC operations, file I/O, and status queue monitoring
• Adds metrics endpoint exposure through Kubernetes service configuration
• Integrates metrics collection throughout the ADC sync workflow and status update processes

Reviewed Changes

Copilot reviewed 18 out of 18 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
pkg/metrics/metrics.go	New metrics package defining Prometheus metrics for ADC sync, file I/O, and status operations
internal/provider/adc/adc.go	Integrates metrics collection into ADC sync operations with timing and error tracking
internal/controller/status/updater.go	Adds queue length tracking for status update operations
test/e2e/scaffold/scaffold.go	Adds helper method to expose metrics endpoint for testing
test/e2e/apisix/route.go	Implements e2e test validation for metrics endpoint functionality
test/e2e/framework/manifests/ingress.yaml	Configures metrics port exposure in Kubernetes service and deployment
test/e2e/framework/manifests/apisix.yaml	Adds control port configuration for APISIX container
go.mod	Upgrades Go version to 1.23 and promotes prometheus client to direct dependency
README.md	Updates Go version requirement documentation
.github/workflows/*.yml	Updates CI/CD workflows to use Go 1.23

[github-actions]

conformance test report - apisix-standalone mode

apiVersion: gateway.networking.k8s.io/v1
date: "2025-07-25T08:38:56Z"
gatewayAPIChannel: standard
gatewayAPIVersion: v1.2.0
implementation:
  contact: null
  organization: APISIX
  project: apisix-ingress-controller
  url: https://github.com/apache/apisix-ingress-controller.git
  version: v2.0.0
kind: ConformanceReport
mode: default
profiles:
- core:
    failedTests:
    - HTTPRouteMatchingAcrossRoutes
    result: failure
    skippedTests:
    - HTTPRouteHTTPSListener
    statistics:
      Failed: 1
      Passed: 31
      Skipped: 1
  name: GATEWAY-HTTP
  summary: Core tests failed with 1 test failures.

[github-actions]

conformance test report - apisix mode

apiVersion: gateway.networking.k8s.io/v1
date: "2025-07-25T08:40:09Z"
gatewayAPIChannel: standard
gatewayAPIVersion: v1.2.0
implementation:
  contact: null
  organization: APISIX
  project: apisix-ingress-controller
  url: https://github.com/apache/apisix-ingress-controller.git
  version: v2.0.0
kind: ConformanceReport
mode: default
profiles:
- core:
    failedTests:
    - HTTPRouteInvalidBackendRefUnknownKind
    result: failure
    skippedTests:
    - HTTPRouteHTTPSListener
    statistics:
      Failed: 1
      Passed: 31
      Skipped: 1
  name: GATEWAY-HTTP
  summary: Core tests failed with 1 test failures.

[github-actions]

conformance test report

apiVersion: gateway.networking.k8s.io/v1
date: "2025-07-25T08:35:56Z"
gatewayAPIChannel: standard
gatewayAPIVersion: v1.2.0
implementation:
  contact: null
  organization: APISIX
  project: apisix-ingress-controller
  url: https://github.com/apache/apisix-ingress-controller.git
  version: v2.0.0
kind: ConformanceReport
mode: default
profiles:
- core:
    result: partial
    skippedTests:
    - HTTPRouteHTTPSListener
    statistics:
      Failed: 0
      Passed: 32
      Skipped: 1
  name: GATEWAY-HTTP
  summary: Core tests partially succeeded with 1 test skips.