Please provide link to gitlab issue or ADR(Architecture Decision Record)
System was throwing 5xx error code earlier which resulted in implying that service was unavailable.
Introduced variable annotation in os core common and used the latest version of the same in here. The version upgrade introduced some jar files which weren't compatible with springfox, so replaced springfox with OpenApi as part of latest commits.
Yes, Unit test case is introduced in os core common repo and integration test case is introduced as part of this MR