Metadata Library is replace in wM 8 by CentraSite Active SOA.
I find it quite useless in wM 7. However when you are on designer process development view, you right click in the name of the process and click on “publish” option.
This will publish and update your metadata, to the server you defined under Designer → Window → preferences → Software AG → Metadata Library.
Also if I recall, you can use navigator view and close projects. When you open a project again metadata is regenerated.
Good luck
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