Keep gravity reconnects on discovered endpoints

[jhaynie]

Summary

• keep multi-endpoint Gravity reconnects on the discovered direct endpoint set
• avoid collapsing direct per-Ion endpoints back to the shared bootstrap/NLB address during reconnect
• add a regression test covering the direct-endpoint-to-bootstrap collapse case

Validation

• go test ./gravity -run 'TestReResolveEndpointURL_PrefersDiscoveredDirectEndpointsOverBootstrapDNS|TestReResolveEndpointURL_'
• go test ./gravity

Summary by CodeRabbit

• Improvements

  • Enhanced endpoint re-resolution logic to better handle multi-endpoint configurations by prioritizing discovered endpoints and reducing unnecessary DNS lookups.

• Tests

  • Added test coverage for endpoint re-resolution with discovered endpoints.

[coderabbitai]

Caution

Review failed

The pull request is closed.

ℹ️ Recent review info

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Configuration used: Organization UI

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Plan: Pro

Run ID: 1963692c-e26b-4876-b6e3-0864beccf1be

📥 Commits

Reviewing files that changed from the base of the PR and between 6638d0e and 008e73f.

📒 Files selected for processing (2)

• gravity/grpc_client.go
• gravity/reresolve_test.go

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📝 Walkthrough

Walkthrough

Adds endpoint re-resolution logic to prioritize discovered direct endpoints over DNS/TLSServerName fallback. Introduces helper method reResolveFromDiscoveredSet to evaluate discovered URLs and prevent collapsing multiple direct endpoints onto a shared address, with corresponding unit test validation.

Changes

Cohort / File(s)	Summary
Endpoint Re-resolution Enhancement gravity/grpc_client.go, gravity/reresolve_test.go	Implements new reResolveFromDiscoveredSet helper that prioritizes discovered endpoints in multi-endpoint mode to avoid DNS re-resolution collapsing multiple direct endpoints. Includes unit test validating correct behavior when discovered endpoints already cover the endpoint pool, ensuring no unintended DNS lookups occur.

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