警告：“pecl / mongo”已被弃用，支持“channel：/// mongodb”

What does that pecl message mean? I mean specifically how does one use the channel described in the error message? ... or in other words how can I address this error (but not specific to mongo, i.e. I get this failure not just when trying to install Mongo but also when trying to install other things and I don't understand how to fix it in general).What does that pecl message mean? I mean specif