Boards may be stuck in "Reserved" state
Background: There was a very long (7K+) queue of jobs for https://lite.validation.linaro.org/scheduler/device_type/disco-l475-iot1 . Based on @stevanradakovic's suggestion, I wrote a script which uses REST API to cancel all but the most recent jobs in the queue. Once script finished, I noticed that 2 of the available boards have "Reserved" state, without clear indication what they are reserved for (IIRC, normally, it's "Reserved for #"). The boards obviously don't take any further jobs. Attempts to reset "Reserved" status by manipulating board Health don't lead to any effect (state remains "Reserved").