2nd this! Add-on was working fine in 6.4.1, credentials worked and was indexing data. Upgraded our on-prem enterprise to 6.5.1 and now when Splunk loads I get script error alert messages and no data indexes. Credentials still work because if I try to add a new input it still populates the drop-downs with my correct Google Cloud project info and valid monitoring metrics.
I've had a support case open for 20 days now with no headway.