I have dashboards with iframe and img tags and some other stuff. When I generate PDF in new version of Splunk, I got PDF only with charts. There is no any img neither iframe. How can I be able to get what I want?
You can't. splunk's PDF generation works at the data level to generate a printable, and different, version of the rendered data. it does not simply take a screen print of the web page, which would be inappropriate and generally unreliable.