[BEAM-780] Add support for pipeline metrics

• Type: New Feature
• Status: Resolved
• Priority: P2
• Resolution: Fixed
• Fix Version/s: Not applicable
• Component/s: sdk-py-core
• Labels: sdk-consistency
• Assignee: Pablo Estrada
• Reporter: Ahmet Altay
• Created: 19/Oct/16 22:21
• Updated: 16/May/20 13:35
• Resolved: 17/Mar/17 21:19

Description

Remove aggregators and replace them with the metrics API.

See: https://issues.apache.org/jira/browse/BEAM-147 for the Java SDK.