apache / apache/beam

MetricsFilter assumes step names to be in a specific format

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bug core java P3
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Description

Currently, MetricsFilter assumes step names to be in "a/b/c" format where each component would define a transform.

https://github.com/apache/beam/blob/51b2a3368ce6764f9f16ce602136e5d0221f8cab/sdks/java/core/src/main/java/org/apache/beam/sdk/metrics/MetricsFilter.java#L68

But Beam does not guarantee such a format and runners may choose arbitrary IDs as step IDs.

Imported from Jira [BEAM-12154](https://issues.apache.org/jira/browse/BEAM-12154). Original Jira may contain additional context.
Reported by: chamikara.

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