Hi Zhenxu has just finished the SkyWalking OAP Server 8.8.1 release. Due to the critical bugs found and fixed, 8.8.0 is not recommended anymore.
Take a reference from the change log about what we fixed, https://skywalking.apache.org/events/release-apache-skywalking-apm-8-8-1/. As 8.8.0 is not recommended, it has been removed from the ASF release mirror, our download/doc pages, and docker hub. Sheng Wu 吴晟 Twitter, wusheng1108
