v4.x backport: doc: add `added:` information for cluster
v4.x backport of https://github.com/nodejs/node/pull/7640
The only conflict was due to the missing exitedAfterDisconnect
.
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
v4.x backport of https://github.com/nodejs/node/pull/7640
The only conflict was due to the missing exitedAfterDisconnect
.