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+**Title:** Add rate limit support </br>
+**Date:** 2021-12-09 </br>
+
+# Summary
+Add support for rate-limiting add-leaf requests via second-level domain name.
+
+# Description
+A sigsum log requires a submitter to prove that a domain name is aware of their
+public verification key.  Rate limits can then be applied per second-level
+domain name.  Trillian has built-in rate-limiting using a so-called quota
+manager; gRPC calls include an arbitrary `charge_to` string that is used as an
+identifier with regards to who should be charged for the request.
+
+First investigate whether Trillian's built-in rate limiting can be used and with
+which assumptions.  For example, is `etcd` a required process?  Then implement
+and document how an operator can configure sigsum-log-go with rate limits.