Graylog2 / Graylog2/graylog2-server
sidecars lost connection with graylog server after upgrading Graylog from version 3.2.3 to 3.3.0
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Description
After upgrading Graylog from version 3.2.3 to 3.3.0 sidecars lost connection with graylog server.
As I investigate it can be related with API token wrong format in MongoDB.
Screenshot from Graylog GUI shows the null instead of right token after upgrading:

_Originally posted by @valumar in https://github.com/Graylog2/graylog2-server/issues/7944#issuecomment-636100657_
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