I can't remove "Region" dimension from EventBridge Pipes custom metrics

[fabio-vitali-docebo]

Version

v5.2.0

Steps and/or minimal code example to reproduce

const monitor = new MonitoringFacade(...);
const metricFactory = monitor.createMetricFactory();

metricFactory.createMetric(
    name: 'Duration',
    statistic: MetricStatistic.P95,
    name: 'Duration',
    { PipeName: pipe.pipeName },
    undefined,
    'EventBridge/Pipes',
    Duration.minutes(10)
);

Expected behavior

I want to create the custom metric with only the "PipeName" dimension

Actual behavior

The "Region" dimension is present

Other details

EventBridge Pipes metrics can only be partitioned by "PipeName" dimension so, with "Region" additional dimension, I can't see PipeName partitioned metrics diagrams on CloudWatch.

If I pick the metric browsing the "EventBridge/Pipes" namespace as I show below, the "Duration" metric about a specific PipeName is showed:

[fabio-vitali-docebo]

Sorry, I misunderstood some information that CloudWatch displays, in fact, incorrectly. the real problem seems to be the incorrect namespace of the metrics: instead of "EventBridge/Pipes" it should have been "AWS/EventBridge/Pipes".