That is very informative. Question thou, the above api returns list of servers, how to know which ones are available or criteria to choose the right server. It seems that even the default cluster has availability 1
name":“US West: San Francisco, CA”,“availability”:1.0,“_id”:23,“default”:true,“url_template”:"rtmp://live.twitch.tv/app/{stream_key}
Also from logs its seems that RTMP packets were acknowledged properly, so i doubt that its availability issue.