[Hawkular-dev] Availability (Service and UI)

[Thomas Heute]

Getting back to availability discussion...

To me availability is a set of periods, not so much "time series" and we 
should just record change of status (closing the previous event and 
opening a new one).

     - Server is up from 8:00am to 11:30am
     - Server is down from 11:30am to 11:32am
     - Server is unknown from 11:32am to 12:00pm (an agent running on a 
machine can tell if a server is up or down, if the agent dies then we 
don't know if the server is up or down)
     - Server is in erratic state from 12:00pm to 12:30pm (agent reports 
down every few requests)

We were discussing the best way to represent availability over time in a 
graph, representation in RHQ [1] is very decent IMO, can be extended 
with more colors to reflect how often/long the website was down for each 
"brick" (if the line represent a year with 52 blocks, 1 block can be 
more or less red depending on how long it was done during the week).

But thinking of it more, availability graph is not that interesting by 
itself IMO and more interesting in the context of other values.
I attached a mockup of what I meant, a red area is displayed on response 
time graph, that means that the system is down, obviously there is no 
response time reported anymore in that period. Earlier there is an 
erratic area, seems related to higher response time ;) Rest of the time 
the system is just up and running...

Additionally I would want to see reports of availability:
     - overall availability over a period of time (a day, a month, a 
year...). "99.99% available in the past month"
     - lists of the down periods with start dates and duration for a 
particular resource or set of resources (filtering options)

Thoughts ?

[1] 
http://3.bp.blogspot.com/-0MsmG5h5i5E/TfjTMZlvx3I/AAAAAAAAABU/6PKDs0RlzuI/s1600/ProblemManagement-RHQ.png

Thomas
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