Aggregate Platform Uptime SLA algorithm. Aggregate amount of runnable time a platform managed to deliver for a set of tasks from the moment of reaching them RUNNING status. Excludes any time a task is not in a runnable state due to user activities (e.g. newly created waiting for host assignment or restarted/killed by the user). Aggregate platform uptime calculated as:
APU = SUM(Up_time) / SUM(SI - Removed_time) where: Up_time - the aggregate instance UP time over the sampling interval (SI); SI - sampling interval (e.g. 1 minute); Removed_time - the aggregate instance REMOVED time over the sampling interval.
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