I'm looking for documentation or explanation for how keys expire in the limit_req_zone. I have the basic documenations here:
*A client IP address serves as a key. Note that instead of $remote_addr, the $binary_remote_addr variable is used here. The $binary_remote_addr variable’s size is always 4 bytes for IPv4 addresses or 16 bytes for IPv6 addresses. The stored state always occupies 64 bytes on 32-bit platforms and 128 bytes on 64-bit platforms. One megabyte zone can keep about 16 thousand 64-byte states or about 8 thousand 128-byte states. If the zone storage is exhausted, the server will return the 503 (Service Temporarily Unavailable) error to all further requests.* But there's no explanation for how the key cache eventually clears itself. Is any available?
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