We publish the release notes when customer-facing changes of rate and concurrent request limits are deployed to Zuora Sandbox environments. See the Rate and Concurrent Request Limits Release Notes below:
January 26, 2021
Zuora has employed a number of tenant-level rate limits against bursts of incoming traffic to maximize the stability of its service since this release. Zuora rate limits are in addition to, and independent of, the concurrent request limits.
Zuora sets limits on the type and number of requests that a tenant can make per minute, per hour, and per day. See Rate limits for more information.