What does "was" on Commit page mean?

When I open a Commit page e.g. Interface support · wildfly/wildfly-core@434b315 · GitHub

there is under the commit message a label: “was: 9445bfa”

What does that “was:” mean?

That is part of the commit message, not under the commit message. So if you need to know what it means it’s probably best to ask the author of that commit.