Interpretation of 6581 monitor status log messages

When my https monitor marks a pool member down, it logs the following detail in the monitor status down message.

Unable to connect; Response Code: 200 (OK); No successful responses received before deadline.; Response Code: 502 (Bad Gateway)

How is this information interpreted?

It appears to be the responses from the last 3 monitor requests.

Is this telling me that the first test had a response of 200 and didn't match my return string then the second never received a response but the 3rd test came back as a 502 from the content server?

Also, if that's the case, wouldn't it be the oldest request that timed out and not the middle of the three?

I would appreciate any help in understanding exactly how to interpret this so I can convey this to the application and hosting provider.