New Feature: Gating Flux reconciliation

[pjbgf]

This umbrella issue tracks the community requested feature to allow Flux to gate reconciliations, so that even when a source has been updated, Flux would need to wait for certain conditions to be met before reconciling the changes into a cluster.

Amongst other use cases, this feature would allow Flux users to establish Change Freezes and Maintenance Windows without the need of other adhoc solutions (e.g. suspending all Kustomizations/HelmReleases).

For other use cases and further details of the problem statement and the proposed solution refer to the initial discussion or the RFC below.

Outstanding Tasks

• Create RFC detailing scope and solution
  • [RFC] Gating Flux reconciliation #3158
• Add Gated Reconciliations to Kustomize Controller
• Add Gated Reconciliations to Helm Controller
• Documentation