microsoft/gctoolkit

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Tool for parsing GC logs

Stars: 1.3k
Forks: 177
Open beginner issues: 0
Indexed issues: 70
Avg merge: 1d 11h
Merged PRs (30d): 3

Dominant language: Java
License: MIT
Last GitHub push: Sep 3, 2026
Latest indexed: Sep 19, 2026
Contributing guide: Contributing guide
Code of conduct: Code of conduct
Beginner labels: good first issue help wanted

Beginner friendly Everything

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70 open issues indexed

Vulnerability: CWE-409 (zip-bomb) Open

microsoft/gctoolkit#589 · 1 assignee · Opened Sep 8, 2026
Epic: Performance enhancements Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

microsoft/gctoolkit#573 · Opened Jul 14, 2026
Parser: batch Vert.x eventbus messages to cut per-line envelope allocation Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

microsoft/gctoolkit#569 · Opened Jul 7, 2026
Parser: reduce substring + java.time allocation churn in numeric/timestamp parsing Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

microsoft/gctoolkit#568 · Opened Jul 7, 2026
Parser: avoid allocating a fresh Matcher per rule per line in the hot parse path Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

microsoft/gctoolkit#566 · Opened Jul 7, 2026
Relevance Summary:Relevance Check Summary - All Open Issues Open

report

microsoft/gctoolkit#493 · 2 assignees · Opened Feb 26, 2026
[agentics] No-Op Runs Open

agentic-workflows

Difficulty 1/5 Under an hour Newbie friendliness 1/100

microsoft/gctoolkit#492 · 1 comment · Opened Feb 26, 2026
[agentics] Relevance Check Agent failed Open

agentic-workflows

microsoft/gctoolkit#488 · 9 comments · 1 reaction · 2 assignees · Opened Feb 26, 2026
"Concurrent phase not completely recorded" when processing CMS Unified log Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

microsoft/gctoolkit#477 · 3 comments · Opened Dec 11, 2025
Support gc logs where each gc event is described on a single line Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

microsoft/gctoolkit#472 · 8 comments · Opened Nov 28, 2025
Unable to detect Unified-Parallel logs that don't start with "Using Parallel" Open

bug

microsoft/gctoolkit#462 · 2 comments · 1 assignee · Opened Nov 10, 2025
Add source information to events (source file, line number) Open

enhancement

Difficulty 4/5 3-5 days Newbie friendliness 35/100

microsoft/gctoolkit#449 · 4 comments · Opened Jul 9, 2025
Shenandoah Support Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

microsoft/gctoolkit#443 · 4 comments · Opened May 20, 2025
Exception when using RotatingGCLogFile Open

Difficulty 3/5 1-2 days Newbie friendliness 62/100

microsoft/gctoolkit#442 · 6 comments · 1 reaction · Opened May 13, 2025
ZGC parsing refactoring Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

microsoft/gctoolkit#439 · 3 comments · Opened Apr 28, 2025
CMS: CPU times are not coming Open

Difficulty 3/5 1-2 days Newbie friendliness 38/100

microsoft/gctoolkit#386 · 5 comments · Opened Sep 3, 2024
CMS: Heap Size and Occupancy before GC Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

microsoft/gctoolkit#385 · 4 comments · Opened Sep 3, 2024
CMS: Unknown GCCause Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

microsoft/gctoolkit#384 · 4 comments · Opened Sep 3, 2024
CMS: Event received multiple times Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

microsoft/gctoolkit#383 · 4 comments · Opened Sep 3, 2024
ZGC missing data Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

microsoft/gctoolkit#381 · 4 comments · Opened Sep 2, 2024
ZGC events GarbageCollectionType comes "Unknown" Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

microsoft/gctoolkit#380 · 4 comments · Opened Sep 2, 2024
Not receiving G1 Full GC event/data Open

Difficulty 3/5 1-2 days Newbie friendliness 42/100

microsoft/gctoolkit#379 · 4 comments · Opened Sep 2, 2024
G1GC Concurrent Cleanup event Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

microsoft/gctoolkit#378 · 8 comments · Opened Sep 2, 2024
GC Phase Times getter for the Parallel GC Open

Difficulty 2/5 1-3 hours Newbie friendliness 45/100

microsoft/gctoolkit#377 · 3 comments · Opened Sep 2, 2024
G1 – Application stopped times Open

microsoft/gctoolkit#376 · 2 comments · 1 assignee · Opened Sep 2, 2024
Missing data from PermOrMetaspace Open

microsoft/gctoolkit#375 · 2 comments · 1 assignee · Opened Sep 2, 2024
Getters for string&symbol table Open

Difficulty 2/5 1-3 hours Newbie friendliness 50/100

microsoft/gctoolkit#373 · 3 comments · Opened Sep 2, 2024
NullPointerException when processing file without GC Events Open

bug

microsoft/gctoolkit#359 · 9 comments · 1 assignee · Opened Jun 5, 2024
GCToolKit cannot parse `G1Young` event from JDK8's gc log. Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 45/100

microsoft/gctoolkit#357 · 5 comments · Opened May 23, 2024
GCToolKit support for simple logs Open

Difficulty 3/5 1-2 days Newbie friendliness 42/100

microsoft/gctoolkit#348 · 4 comments · Opened Apr 11, 2024
AbstractJavaVirtualMachine.getCommandLine() is currently stubbed out, can't retrieve CLI parameters for Pre-Unified log. Open

Difficulty 3/5 1-2 days Newbie friendliness 38/100

microsoft/gctoolkit#336 · 5 comments · Opened Mar 11, 2024
GCtoolkit doesnt find the full gc pattern Open

Difficulty 4/5 3-5 days Newbie friendliness 30/100

microsoft/gctoolkit#302 · 4 comments · Opened Jul 13, 2023
VertxJVMEventChannel could not be instantiated Open

microsoft/gctoolkit#300 · 6 comments · 1 assignee · Opened Jul 1, 2023
IllegalStateException: Already undeployed Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 42/100

microsoft/gctoolkit#296 · 10 comments · Opened Jun 13, 2023
Memory pool size data Open

microsoft/gctoolkit#285 · 4 comments · 1 assignee · Opened Mar 7, 2023
Java 17 Parallel Old/New Parsing has altered from JDK 11, impacting what is reported as promoted bytes and what is reported in young gen Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 35/100

microsoft/gctoolkit#284 · 4 comments · Opened Mar 6, 2023
gen-z support in Aggregator/Aggregation Open

enhancement

Difficulty 5/5 Over a week Newbie friendliness 25/100

microsoft/gctoolkit#281 · 2 comments · Opened Feb 28, 2023
gen-z support in GCToolKit Open

enhancement

Difficulty 5/5 Over a week Newbie friendliness 20/100

microsoft/gctoolkit#280 · 2 comments · Opened Feb 28, 2023
Diary enhancement for gen-z Open

enhancement

Difficulty 4/5 3-5 days Newbie friendliness 35/100

microsoft/gctoolkit#279 · 2 comments · Opened Feb 28, 2023
gen-z parser Open

enhancement

Difficulty 5/5 Over a week Newbie friendliness 25/100

microsoft/gctoolkit#278 · 2 comments · Opened Feb 28, 2023
parse rules for gen-Z support Open

enhancement

Difficulty 3/5 1-2 days Newbie friendliness 35/100

microsoft/gctoolkit#276 · 2 comments · Opened Feb 28, 2023
Unified logs missing time stamps causes NPE Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

microsoft/gctoolkit#274 · 2 comments · Opened Feb 24, 2023
Extract command line options for unified logs Open

enhancement

Difficulty 4/5 3-5 days Newbie friendliness 35/100

microsoft/gctoolkit#263 · 2 comments · Opened Jan 25, 2023
Add Unified Safepointing to the JVMEventParser? Open

question

Difficulty 5/5 Over a week Newbie friendliness 20/100

microsoft/gctoolkit#260 · 2 comments · Opened Jan 17, 2023
Replace LOG_FRAGMENT_THRESHOLD_SECONDS with a heuristic in AbstractJavaVirtualMachine Open

enhancement

Difficulty 5/5 Over a week Newbie friendliness 25/100

microsoft/gctoolkit#258 · 2 comments · Opened Jan 17, 2023
Should we throw a better exception instead of logging, eating and returning a null object in GCToolkit main class Open

enhancement

Difficulty 4/5 3-5 days Newbie friendliness 25/100

microsoft/gctoolkit#256 · 3 comments · Opened Jan 17, 2023
Consider checking for keywords in commit messages to align with JReleaser syntax for Release notes Open

enhancement

Difficulty 5/5 Over a week Newbie friendliness 35/100

microsoft/gctoolkit#244 · 2 comments · Opened Nov 4, 2022
Document Release Process for maintainers Open

enhancement

microsoft/gctoolkit#243 · 2 comments · 1 assignee · Opened Nov 4, 2022
Remove G1RealPauseEvent Open

Difficulty 2/5 1-3 hours Newbie friendliness 35/100

microsoft/gctoolkit#236 · 2 comments · Opened Sep 27, 2022
Revisit G1PauseEvent and a G1RealPauseEvent Open

enhancement

Difficulty 4/5 3-5 days Newbie friendliness 35/100

microsoft/gctoolkit#235 · 2 comments · Opened Sep 27, 2022

microsoft/gctoolkit

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