[atlas] When to consider a measurement finished

Hi all,

I am currently trying to do some measurements according to the following
steps:

1. create a one-off measurement
2. wait for it to finish, by periodically polling the msmid and checking
the status.
3. fetch the results

However, the system takes a pretty long time to set the status to
finished, even when all results are already in (maybe 10 minutes?).

What heuristics/method do you recommend to determine whether to consider
a measurement as finished?

One option I consider is to periodically fetch all results for a given
msmid and checking if the number of results matches the number of probes
assigned to the measurement. However, I suspect that causes a much
higher load on the infrastructure.

Best regards,

Wouter de Vries