This resets the number of nodes that Couchbase Server has automatically failed-over. You can send to request to set the auto-failover number to 0. This is a global setting for all clusters. You need to be authenticated to change this value. No parameters are required:

shell> curl -i -u Administrator:letmein \
    http://localhost:8091/settings/autoFailover/resetCount

POST /settings/autoFailover/resetCount HTTP/1.1
Host: node.in.your.cluster:8091
Content-Type: application/x-www-form-urlencoded
Authorization: Basic YWRtaW46YWRtaW4=

200 OK

Possible errors include:

This endpoint isn't available yet.
401 Unauthorized