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Check More options → Requests to see if the build request has been received and accepted. It it has and the build hasn’t started yet, that’s indeed resource contention.
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In the left pane, you can see “Runnning (X/Y)” – these are running jobs vs all currently existing jobs (you can click on that to see the actual jobs). I reckon you can probably only see stats for the projects that you have access to here so only someone with an admin access to the organization can see the whole picture and find out if you’re consistently hitting your resource limits.
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On your other questions, see