Github user jerryshao commented on the issue:
https://github.com/apache/spark/pull/18829
I tend to agree with @ajbozarth , since we already have the APIs to access
metrics dump with json format, this looks like not so necessary. Also directly
displaying such kind of json dump on the UI without formatting seems hard to
use or check. AFAIK usually user will feed this to a monitoring system to
display, rather than directly check on the web UI.
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