harden: switch to equal jitter for retry backoff decorrelation

[0x-SquidSol]

Summary

• Additive-only jitter produced delays in [raw, raw*1.25] — only 25% spread
• In a keeper fleet, all instances retry within the same narrow band after an outage → thundering herd
• Fix: Equal jitter [raw/2, raw] — 2x the spread with a meaningful minimum backoff floor
• jitterFactor: 0 still produces deterministic delays for tests (backward compat)
• Also applied to discovery.ts withJitter helper (same additive-only pattern)

Test plan

• rpc-pool tests pass (57/57) — updated range assertion from [1000,1250] to [500,1000]
• No new test failures (729 passed, same 16 pre-existing)

🤖 Generated with Claude Code

[coderabbitai]

Warning

Rate limit exceeded

@0x-SquidSol has exceeded the limit for the number of commits that can be reviewed per hour. Please wait 29 minutes and 9 seconds before requesting another review.

Your organization is not enrolled in usage-based pricing. Contact your admin to enable usage-based pricing to continue reviews beyond the rate limit, or try again in 29 minutes and 9 seconds.

⌛ How to resolve this issue?

After the wait time has elapsed, a review can be triggered using the @coderabbitai review command as a PR comment. Alternatively, push new commits to this PR.

We recommend that you space out your commits to avoid hitting the rate limit.

🚦 How do rate limits work?

CodeRabbit enforces hourly rate limits for each developer per organization.

Our paid plans have higher rate limits than the trial, open-source and free plans. In all cases, we re-allow further reviews after a brief timeout.

Please see our FAQ for further information.

ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: fe6f8679-bb2e-4628-a277-c3934ce1ea59

📥 Commits

Reviewing files that changed from the base of the PR and between 2f80d79 and f21c831.

📒 Files selected for processing (3)

• src/solana/discovery.ts
• src/solana/rpc-pool.ts
• test/rpc-pool.test.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands and usage tips.}