Tasks run for too long, overrunning their schedule

*Diagnosis*:

The <<task-manager-theory-insufficient-throughput,"Insufficient throughtput to handle the scheduled workload">> theory analyzed a hypothetical scenario where both _drift_ and _load_ were unusually high.

Suppose an alternate scenario, where `drift` is high, but `load` is not, such as the following:

Tasks take multiple attempts to succeed

*Diagnosis*:

A high error rate could cause a task to appear to run late, when in fact it runs on time, but experiences a high failure rate.

Evaluating the health stats above, we can see the following output under `stats.runtime.value.execution.result_frequency_percent_as_number`: