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docs: document CONNECTOR_DISCOVERY_ENABLED for Fusion-only / air-gapped deployments#150

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docs: document CONNECTOR_DISCOVERY_ENABLED for Fusion-only / air-gapped deployments#150
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Summary

Companion to datazip-inc/olake-ui#382, which adds a CONNECTOR_DISCOVERY_ENABLED server flag (and a matching DEFAULT_CONNECTOR_VERSION) to skip Docker Hub / ECR / GCR queries in Fusion-only and air-gapped deployments (datazip-inc/olake-ui#380).

The chart needs no template change to support this — olakeUI.env is already a passthrough map, so any env var set there is propagated to the UI pod. This PR is purely about discoverability: putting the new knob where operators will actually see it.

Changes

  • helm/olake/values.yaml — add a commented example under olakeUI.env showing how to disable discovery and pin a default version.
  • helm/olake/README.md — add a "Disabling Connector Discovery (Fusion-only / Air-gapped)" subsection alongside the existing "Private Container Registry" section. Explains the use case (Fusion-only Iceberg maintenance, no CDC) and the registry-rate-limit motivation.

Notes

Test plan

  • helm lint helm/olake/ clean
  • Manual: render with helm template ... --set olakeUI.env.CONNECTOR_DISCOVERY_ENABLED=false --set olakeUI.env.DEFAULT_CONNECTOR_VERSION=v0.3.18 and confirm both vars appear in the olake-ui Deployment env (they should, since olakeUI.env is already passed through via the existing range loop)

Surface the new olake-ui config flag through the chart's values.yaml comments
and README. No template change is needed since olakeUI.env is already a
passthrough; this is purely a discoverability improvement so operators of
Fusion-only / air-gapped deployments can find the knob.

Companion to datazip-inc/olake-ui#382 and datazip-inc/olake-ui#380.
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