Periodic cgroup memory statistics in SYSINFO records (usage, max usage, RSS, shared memory, and file cache) could momentarily reset to a fixed, near-zero value immediately after GC log rotation, producing a false memory-drop artifact on cgroup memory charts. GCLA now carries forward the last valid cgroup memory reading across the stale initial-stats record replayed at rotation.
GC Log Analyzer 26.09.0
Table of Contents
October 1, 2026
What’s new
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GC Log Analyzer now processes Zing-specific
extlines embedded in extended Zing-style GC logs from Azul Zulu (G1, PGC, ZGC, and CMS). When this data is present, GCLA adds the same Zing-only content it already shows for C4 logs. Each section or chart below is shown only when its backing data is actually present in the log, so a plain OpenJDK log with noextlines is unaffected.Summary page sections added:
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System Info
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Execution Environment Info
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VM Process Info
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JIT Compiler Info
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ReadyNow/RNO information
Chart categories added:
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Sysinfo
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CGroup
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CPU Usage
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Process
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Compiler Statistics
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Deopt Statistics
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ReadyNow
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GC Log Analyzer now supports OpenJDK unified-logging rotated log sequences (for example,
gc.log.0,gc.log.1, … alongside a livegc.logorgc.log.current).-
Opening any one segment of such a sequence prompts you to open the whole series as a single merged log, the same as GCLA already does for rotated C4 logs.
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Segments are ordered by their first embedded timestamp rather than by file suffix, so a sequence works correctly even after its segment numbers have wrapped around.
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