chore(deps): update fluxcd

[dmuiX]

This PR contains the following updates:

Package	Update	Change
flagger (source)	minor	1.42.0 → 1.43.0
loadtester (source)	minor	0.36.0 → 0.37.0

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Release Notes

fluxcd/flagger (flagger)

v1.43.0

Compare Source

Release date: 2026-04-21

This release comes with a new Kubernetes External Metrics provider, enhanced session
affinity support for Istio and Gateway API, and various bug fixes.

Flagger now supports the Kubernetes External Metrics API, enabling the use of the
Datadog Cluster Agent or any other server implementing the Kubernetes External
Metrics API for metric collection. For more information, please see the
External Metrics tutorial.

Session affinity has been enhanced with support for setting a primary cookie name
in Istio routers. This allows the primary deployment's traffic to be routed based
on the session cookie while canary analysis is in progress. For more details, see
the Istio tutorial.

This release is built with Go 1.25. The Kubernetes dependencies have been updated
to 1.35, and the Traefik API has been migrated from traefik.containo.us to
traefik.io.

Improvements

• Add Kubernetes External Metrics provider
  #​1863
• Add support for setting primary cookie name in Istio router
  #​1861
• Add primarySessionAffinityCookie field to sessionAffinity for Gateway API
  #​1858
• Set ingress class via ingressClassName for Contour HTTPProxy
  #​1870
• Add additionalVolumeMounts support for Flagger chart
  #​1880
• List valid mesh providers in CRD and help docs
  #​1874
• Warn when mesh/metrics provider or canary target type isn't valid
  #​1874
• Remove deprecated policy/v1beta1 API from PodDisruptionBudget templates
  #​1885
• Update Kubernetes packages to 1.35
  #​1901
• Update Traefik API from traefik.containo.us to traefik.io
  #​1868
• Update Go dependencies
  #​1900
• Gateway API: only add timeout when specified
  #​1902

Fixes

• Fix bug where CanaryWeight is reset to 0 during CanaryPhasePromoting
  #​1851
• Fix MS Teams notifier to handle 202 status code
  #​1887
• Include HTTP status code in Prometheus error responses
  #​1878
• Fix Datadog metrics to provide HTTP status code on error
  #​1858
• Fix Helm Chart compatibility with Prometheus v3.0+
  #​1811

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