[JENKINS-50008] Heap Histogram (all instances by default)

As -live instances histogram requires a fullgc, the histogram will produce all by default (which doesn't require a fullgc).

You could easily configure it by using the system property -Dcom.cloudbees.jenkins.support.impl. HeapUsageHistogram.FULLGC=true (permanent) or by running from Script Console com.cloudbees.jenkins.support.impl. HeapUsageHistogram.FULLGC=true (temporal) if you want to grab live instances.

The histogram component could be easily disabled by using the system property -Dcom.cloudbees.jenkins.support.impl. HeapUsageHistogram.DISABLE=true (permanent) or by running from Script Console com.cloudbees.jenkins.support.impl. HeapUsageHistogram.DISABLE=true (temporal).

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Originally reported by escoem, imported from: Heap Histogram (all instances by default)

• status: Open
  
• priority: Major
  
• component(s): support-core-plugin
  
• resolution: Unresolved
  
• votes: 0
  
• watchers: 3
  
• imported: 20251212-090250
  

Raw content of original issue

As -live instances histogram requires a fullgc, the histogram will produce all by default (which doesn't require a fullgc).


You could easily configure it by using the system property -Dcom.cloudbees.jenkins.support.impl. HeapUsageHistogram.FULLGC=true (permanent) or by running from Script Console com.cloudbees.jenkins.support.impl. HeapUsageHistogram.FULLGC=true (temporal) if you want to grab live instances.


The histogram component could be easily disabled by using the system property -Dcom.cloudbees.jenkins.support.impl. HeapUsageHistogram.DISABLE=true (permanent) or by running from Script Console com.cloudbees.jenkins.support.impl. HeapUsageHistogram.DISABLE=true (temporal).

Start by locating the HeapUsageHistogram component referenced by the system properties and inspect how it selects all versus live instances. Confirm the default produces all instances without a full GC, FULLGC enables live instances, and DISABLE still suppresses the component; add or update coverage if the component has existing tests.

Written by the indexing model from the issue text.