I have just logged in to a Google Cloud Platform account, and it has several old Projects. I'd like to clean up by deleting the ones I don't need, but for that I need to see a full list of services each Project uses.
I went to the Cloud Resource Manager, and it mentions a Compute Engine Service Agent here and there, but that's it. I know one of those Projects must have some API Keys that I still need, but neither this page, nor the Billing page tell me which one.
Is there one single page that will show me everything a given Project uses, so I am informed enough to decide if I still need it? Please help!