1. Proposed title of this feature request
>>> must-gather should notify before the disk is full on a node.

2. What is the nature and description of the request?

"oc adm must-gather" fills the disk until there is no space left, causing further issues with etcd.

With --node-name option, so we can select one node with enough disk space, but by default, oc adm must-gather still runs on a master node. During log collection, oc adm must-gather seems to collect tons of data from every node, and it ends up filling up the disk.

3. Why does the customer need this? (List the business requirements here)
>>> Master nodes can be affected by running "oc adm must-gather".
   "oc adm must-gather" fills the disk until there is no space left, causing further issues with etcd.

Additional Info:-
>>> Like a sosreport, there should also be an option available in must-gather similar to "--estimate-only".

      --estimate-only

     https://access.redhat.com/solutions/6899391