[FLINK-24235] Only support reporter factories for instantiation

• Type: Technical Debt
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 1.17.0
• Component/s: Runtime / Metrics
• Labels: pull-request-available
• Release Note: Configuring reporters by their class is no longer supported. Reporter implementations must provide a MetricReporterFactory, and all configurations must be migrated to such a factory.
• Assignee: Chesnay Schepler
• Reporter: Chesnay Schepler
• Created: 09/Sep/21 16:55
• Updated: 14/Nov/22 18:16
• Resolved: 14/Nov/22 18:14

Description

Metric reporters can currently be instantiated in one of 2 ways:
a) the reporter class is loaded via reflection
b) the reporter factory is loaded via reflection/ServiceLoader (aka, plugins)

All reporters provided by Flink use the factory approach, and it is preferable because it supports plugins. The plugin approach also has been available 1.11, and I think it's fair to remove the old approach by now.

Issue Links

• is related to: FLINK-27206 Deprecate reflection-based reporter instantiation
• is related to: FLINK-24236 Migrate tests to reporter factories
• links to: GitHub Pull Request #21296