Tempo currently not supports addition of Jira custom fields as worklog attribute. As workaround, it is possible to define a REST endpoint that fetches the values of an issue customfield. However when the issue customfield is updated on the issue, the old value(s) still remain in the log time dialog. The user must do a browser refresh in order to load the new value(s).
As I understand, the values are locally cached because of performance reasons.
Suggestion is to give the user the option to reload the values in the log time dialog.
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