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Add a statement for MAL practice. #11985

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Mar 5, 2024
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Add a statement for MAL practice. #11985

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Add a statement for MAL practice.
wu-sheng Mar 5, 2024
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Update mal.md
wu-sheng Mar 5, 2024
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8 changes: 8 additions & 0 deletions docs/en/concepts-and-designs/mal.md
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Expand Up @@ -175,6 +175,14 @@ instance_trace_count{az="az-1"} 133 // 100 + 33
instance_trace_count{az="az-3"} 20
```

___
**Note, aggregation operations affect the samples from one bulk only. If the metrics are reported parallel from multiple instances/nodes
through different SampleFamily, this aggregation would NOT work.**

In the best practice for this scenario, build the metric with labels that represent each instance/node. Then use the
[AggregateLabels Operation in MQE](../api/metrics-query-expression.md#aggregatelabels-operation) to aggregate the metrics.
___

### Function

`Duration` is a textual representation of a time range. The formats accepted are based on the ISO-8601 duration format {@code PnDTnHnMn.nS}
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