I have a dashboard which has 10 charts, and I set it up to refresh every 10 seconds.
<refresh>10s</refresh>
When I exported the dashboard to a PDF file, some of my charts were not displayed properly. (The other charts were showing properly.)
Instead, URLs like below are shown, and when I tried to access the URL, Unknow sid error is shown up on the browser.
{"messages":[{"type":"FATAL","text":"Unknown sid."}]}
[Answer]
This issue is happening due to the timing of dashboard refresh and pdf export.
When a dashboard is due to refresh, it calls cancel of all the dashboard search jobs and request for a fresh run.
This issue happens when refresh kicks while pdfgen is still rendering the searches.
This is a limitation to PDF generation. (We'll update the document soon.)
https://docs.splunk.com/Documentation/Splunk/7.2.3/Viz/DashboardPDFs
[Workaround]
https://docs.splunk.com/Documentation/Splunk/7.2.3/Search/Aboutrealtimesearches
[Behavior]
dashboard
pdfgen