Can you expand a bit more on what you are looking for? When you talk about API connections, are you thinking about the feeds of data coming in via APIs, or are you talking about the APIs like the detection API, the search API, etc and their usage?
I'm not going to say up front that we have a solution to what you are looking for but to @ashnaiku question, depending on what you are looking for, some of the information may be available in the GCP console.