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<!-- Describe what has changed in this PR --> **What changed?** * Added a new possible value for the `caller-type` header: `operator` * This header should be set by web UI and tctl to indicate that requests should be given higher precedence * Rate limiters for persistence, history, matching, and visibility were updated with a new priority corresponding to `operator` requests * These new priorities have a lower RPS limit to prevent abusing the header to get high priority for all requests. Currently the operator priority is allowed 20% of the rate of the existing rate limiters <!-- Tell your future self why have you made these changes --> **Why?** When the system is being throttled, users would like to be able to debug using the web UI and/or tctl without running into rate limit errors <!-- How have you verified this change? Tested locally? Added a unit test? Checked in staging env? --> **How did you test it?** New unit tests <!-- Assuming the worst case, what can be broken when deploying this change to production? --> **Potential risks** The operator RPS is set too low leading to new rate limit errors <!-- Is this PR a hotfix candidate or require that a notification be sent to the broader community? (Yes/No) --> **Is hotfix candidate?** No