cylc gscan: add failed information

[kaday]

From issue1164 part two:
" Request from BOM:

• in cases where the suite has failed task, the name of the failed task (for multiple failed tasks, I suppose it could be either the first failed task or number of the failed tasks)"

[hjoliver]

On hover-over, gscan now shows the number of tasks in each state (including failed).

Names of failed tasks - maybe that's worth doing, I'm not sure. Is failed fundamentally more important than all the other states (it certainly is quite important, but what about submit-failed, expired, retrying, ...). We can't list them all in gscan hover-over, for big suites. @cylc/core - opinions on whether to close this or not?

[kaday]

I think that failed is far more important especially after having just started a 50:50 secondment where I am working closer to the operational side and I am seeing how they are using gscan. If the rest of the @cylc/core agree I will make this a priority now.

[matthewrmshin]

I think a good interface for this is to print out a list of, say, the most recent 10 (configurable?) task IDs that fall into each category. For failed tasks, the total should be a small number, so would normally display everything relevant. Otherwise, we can print the 10 most recent task IDs, then say something like e.g. and 62438 more.

[arjclark]

As this list can get potentially quite long and render the hover overs useless, what might be nicer instead would be to have the ability to get a quick listing of tasks in a particular state of interest via a right click menu or something that opens up a popup with a scroll bar window if needed.

[matthewrmshin]

(To elaborate my comment above, I am thinking of a hover-over for each state, instead of an overall hover-over, like we do now.)

[kaday]

Matt's idea is what I was considering but I had not thought to limit it, which I think is an ace idea and will allow the hover to still work.

[hjoliver]

Yeah, limiting to a max number of tasks makes the hover-over workable. We could do both: hover-over for minimal info about a max of 10 tasks, right click menu to get more detailed information about all tasks in that state in a popup window?

[kaday]

The PSA's here said it would really help them if the 10 most recently failed tasks were listed in the hover-over.

[hjoliver]

@kaday - 'scuse my ignorance, but a "PSA"?

[benfitzpatrick]

(Our acronym for operational suite controller)