wu-sheng commented on issue #2997: when oapService and UI restart,the UI do not display the agent services URL: https://github.com/apache/skywalking/issues/2997#issuecomment-508314982 This log seems normal. But which storage are you using? Since you are talking about a reboot, the OAP runs in H2 storage default, which is an in-memory DB. The metadata lost, and no data will show unless you reboot the agent. Also, in this case, should be able to see many NPE(s) in OAP logs.
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