Specifies the maximum number of simultaneous requests
outstanding to the DUO Auth API server, and the maximum number of HTTP
connections to the server. If more than this number of requests are
waiting, then subsequent requests will be queued and sent after a reply a
received from an outstanding request. Defaults to
20
.
If the total number of requests that are
waiting and queued exceeds 2 * Slots
, a warning is
logged and the API is marked dead to prevent further
overload.