[CASSANDRA-16136] Provide access to metrics from in-jvm dtests

• Type: New Feature
• Status: Resolved
• Priority: Normal
• Resolution: Fixed
• Fix Version/s: 2.2.20, 3.0.24, 3.11.10, 4.0-beta4, 4.0
• Component/s: Test/dtest/java
• Change Category: Quality Assurance
• Complexity: Normal
• Platform: All

Source Control Link

https://github.com/apache/cassandra/commit/033e099f9afef184e476b50f8ee8d0d9742a623b

Test and Documentation Plan

Test for a single metric included.

• Assignee: Alex Petrov
• Reporter: Alex Petrov

Authors

Alex Petrov

Reviewers

Benedict Elliott Smith

• Created: 23/Sep/20 07:21
• Updated: 03/Jan/21 16:58
• Resolved: 14/Dec/20 13:41

Description

Current implementation requires of in-jvm dtests requires using callOnInstance in order to get metrics out of the in-jvm test node. Since many dtests require to check metrics, we need a version-agnostic mechanism that allows us to query the value of the metric by its published name instead of peeking into internals.