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Skill references: describe null MXU and compute_efficiency_percent - #4086

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Skill references: describe null MXU and compute_efficiency_percent

The get_overview and get_kpi_metrics references now say that
mxu_utilization_percent comes from hardware performance counters and is null
when the capture has no counters. In that case mxu_utilization_status gives the
reason and a way to get the value.

The references also describe compute_efficiency_percent, a FLOP rate estimate
from the XLA cost model. A new "Missing Hardware Counters" section in the
get_overview reference tells the agent to report MXU utilization as unknown,
not 0%. It also tells the agent to use compute_efficiency_percent as a
cost-model estimate, to try get_kernel_utilization, and to capture the profile
again with counters.

The get_overview and get_kpi_metrics references now say that
mxu_utilization_percent comes from hardware performance counters and is null
when the capture has no counters. In that case mxu_utilization_status gives the
reason and a way to get the value.

The references also describe compute_efficiency_percent, a FLOP rate estimate
from the XLA cost model. A new "Missing Hardware Counters" section in the
get_overview reference tells the agent to report MXU utilization as unknown,
not 0%. It also tells the agent to use compute_efficiency_percent as a
cost-model estimate, to try get_kernel_utilization, and to capture the profile
again with counters.

PiperOrigin-RevId: 1021022701
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