Add java gc exporter to exporter list

[loyispa]

Please add this new exporter to exporter list. Please let me know if something missing, thanks.

Sample metrics:

# HELP jgc_event_duration Duration(ms) of gc event
# TYPE jgc_event_duration summary
jgc_event_duration_count{path="/Users/momo/Desktop/zgc.log",category="zgc",} 11.0
jgc_event_duration_sum{path="/Users/momo/Desktop/zgc.log",category="zgc",} 12530.878999999999
# HELP jgc_log_line_total Number of process log lines
# TYPE jgc_log_line_total counter
jgc_log_line_total{path="/Users/momo/Desktop/zgc.log",} 4230.0
# HELP jgc_zgc_metaspace_used zgc metaspace usage
# TYPE jgc_zgc_metaspace_used gauge
jgc_zgc_metaspace_used{path="/Users/momo/Desktop/zgc.log",} 646144.0

[juliusv]

Thanks!

CC-ing @fstab here just for a quick glance because I know nothing about Java, and he can judge the metrics and possible overlap with any of the other Java exporters better :)

Some notes from my side:

Please keep the list lexicographically sorted:

• ...
• Java GC exporter
• JavaMelody
• JMX exporter
• ...

And if we link it here, we'll want to make sure that the exporter somewhat sticks to the general and exporter-specific metrics naming guidelines, see https://prometheus.io/docs/practices/naming/ and https://prometheus.io/docs/instrumenting/writing_exporters/#metrics.

Specifically:

• jgc_event_duration... should have a unit suffix, and it should be in base units (so seconds instead of milliseconds, so jgc_event_duration_seconds_...). Should jgc_zgc_metaspace_used also have a unit, like bytes (jgc_zgc_metaspace_used_bytes), or is that unitless for some valid reason?
• jgc_log_line_total would more commonly be named jgc_log_lines_total (plural).

[loyispa]

Thanks!

CC-ing @fstab here just for a quick glance because I know nothing about Java, and he can judge the metrics and possible overlap with any of the other Java exporters better :)

Some notes from my side:

Please keep the list lexicographically sorted:

• ...
• Java GC exporter
• JavaMelody
• JMX exporter
• ...

And if we link it here, we'll want to make sure that the exporter somewhat sticks to the general and exporter-specific metrics naming guidelines, see https://prometheus.io/docs/practices/naming/ and https://prometheus.io/docs/instrumenting/writing_exporters/#metrics.

Specifically:

• jgc_event_duration... should have a unit suffix, and it should be in base units (so seconds instead of milliseconds, so jgc_event_duration_seconds_...). Should jgc_zgc_metaspace_used also have a unit, like bytes (jgc_zgc_metaspace_used_bytes), or is that unitless for some valid reason?
• jgc_log_line_total would more commonly be named jgc_log_lines_total (plural).

Thanks for your explaination, i will make an update next.

[loyispa]

Hi @juliusv, dou you have time to review the changes? I have renamed the metrics as per the guidelines, thanks.

Sample metrics:

# HELP jgc_g1_phantom_reference_pause_duration_seconds phantom reference pause duration
# TYPE jgc_g1_phantom_reference_pause_duration_seconds summary
# HELP jgc_g1_old_assign_regions amount of g1 old assign regions
# TYPE jgc_g1_old_assign_regions gauge
jgc_g1_old_assign_regions{path="/Users/momo/Desktop/g1gc.log",} 341.0
# HELP jgc_g1_phantom_free_references amount of g1 phantom free references
# TYPE jgc_g1_phantom_free_references gauge
# HELP jgc_safepoint_waiting_to_block_threads amount of safepoint waiting to block threads
# TYPE jgc_safepoint_waiting_to_block_threads gauge
# HELP jgc_g1_humongous_after_collection_regions amount of g1 humongous regions after collection
# TYPE jgc_g1_humongous_after_collection_regions gauge
jgc_g1_humongous_after_collection_regions{path="/Users/momo/Desktop/g1gc.log",} 41.0
# HELP jgc_zgc_2ms_mmu_ratio zgc 2ms mmu ratio
# TYPE jgc_zgc_2ms_mmu_ratio gauge
# HELP jgc_zgc_allocated_mark_end_bytes zgc allocated mark end
# TYPE jgc_zgc_allocated_mark_end_bytes gauge
# HELP jgc_g1_final_reference_pause_duration_seconds final reference pause duration
# TYPE jgc_g1_final_reference_pause_duration_seconds summary
# HELP jgc_zgc_1m_cpu_load zgc latest 1 minute cpu load average
# TYPE jgc_zgc_1m_cpu_load gauge
# HELP jgc_g1_survivor_before_collection_regions amount of g1 survivor region before collection
# TYPE jgc_g1_survivor_before_collection_regions gauge
jgc_g1_survivor_before_collection_regions{path="/Users/momo/Desktop/g1gc.log",} 5.0
# HELP jgc_g1_metaspace_size_after_collection_bytes metaspace size bytes after collection
# TYPE jgc_g1_metaspace_size_after_collection_bytes gauge
jgc_g1_metaspace_size_after_collection_bytes{path="/Users/momo/Desktop/g1gc.log",} 4.9545216E8
# HELP jgc_zgc_20ms_mmu_ratio zgc 20ms mmu ratio
# TYPE jgc_zgc_20ms_mmu_ratio gauge
# HELP jgc_zgc_relocate_start_free_bytes zgc relocate start free
# TYPE jgc_zgc_relocate_start_free_bytes gauge
# HELP jgc_zgc_metaspace_reserved_bytes metaspace reserved memory
# TYPE jgc_zgc_metaspace_reserved_bytes gauge
# HELP jgc_g1_old_after_collection_regions amount of g1 old regions after collection
# TYPE jgc_g1_old_after_collection_regions gauge
jgc_g1_old_after_collection_regions{path="/Users/momo/Desktop/g1gc.log",} 341.0
# HELP jgc_generational_heap_occupancy_before_collection_bytes heap occupancy before collection
# TYPE jgc_generational_heap_occupancy_before_collection_bytes gauge
# HELP jgc_zgc_concurrent_mark_duration_seconds zgc concurrent mark duration
# TYPE jgc_zgc_concurrent_mark_duration_seconds summary
# HELP jgc_generational_classspace_occupancy_after_collection_bytes class space occupancy after collection
# TYPE jgc_generational_classspace_occupancy_after_collection_bytes gauge
# HELP jgc_generational_metaspace_size_after_collection_bytes metaspace size after collection
# TYPE jgc_generational_metaspace_size_after_collection_bytes gauge
# HELP jgc_zgc_mark_start_used_bytes zgc mark start used
# TYPE jgc_zgc_mark_start_used_bytes gauge
# HELP jgc_g1_survivor_after_collection_regions amount of g1 survivor region after collection
# TYPE jgc_g1_survivor_after_collection_regions gauge
jgc_g1_survivor_after_collection_regions{path="/Users/momo/Desktop/g1gc.log",} 12.0
# HELP jgc_zgc_pause_relocate_start_duration_seconds zgc pause relocate start duration
# TYPE jgc_zgc_pause_relocate_start_duration_seconds summary
# HELP jgc_generational_young_occupancy_before_collection_bytes young generation occupancy before collection
# TYPE jgc_generational_young_occupancy_before_collection_bytes gauge
# HELP jgc_zgc_concurrent_relocate_duration_seconds zgc concurrent relocate duration
# TYPE jgc_zgc_concurrent_relocate_duration_seconds summary
# HELP jgc_zgc_allocated_reclaim_end_bytes zgc allocated reclaim end
# TYPE jgc_zgc_allocated_reclaim_end_bytes gauge
# HELP jgc_generational_metaspace_occupancy_before_collection_bytes metaspace occupancy before collection
# TYPE jgc_generational_metaspace_occupancy_before_collection_bytes gauge
# HELP jgc_g1_archive_assign_regions amount of g1 archive assign regions
# TYPE jgc_g1_archive_assign_regions gauge
jgc_g1_archive_assign_regions{path="/Users/momo/Desktop/g1gc.log",} 0.0
# HELP jgc_generational_tenured_size_after_collection_bytes tenured generation size after collection
# TYPE jgc_generational_tenured_size_after_collection_bytes gauge
# HELP jgc_g1_eden_before_collection_regions amount of g1 eden region before collection
# TYPE jgc_g1_eden_before_collection_regions gauge
jgc_g1_eden_before_collection_regions{path="/Users/momo/Desktop/g1gc.log",} 1100.0
# HELP jgc_generational_phantom_references amount of phantom references
# TYPE jgc_generational_phantom_references gauge
# HELP jgc_safepoint_initially_running_threads amount of safepoint initially running threads
# TYPE jgc_safepoint_initially_running_threads gauge
# HELP jgc_generational_young_size_before_collection_bytes young generation size before collection
# TYPE jgc_generational_young_size_before_collection_bytes gauge
# HELP jgc_startup_timestamp_seconds Timestamp of exporter startup
# TYPE jgc_startup_timestamp_seconds gauge
jgc_startup_timestamp_seconds 1.695793619203E9
# HELP jgc_zgc_concurrent_select_relocationset_duration_seconds zgc concurrent select relocationset duration
# TYPE jgc_zgc_concurrent_select_relocationset_duration_seconds summary
# HELP jgc_g1_soft_references amount of g1 soft references
# TYPE jgc_g1_soft_references gauge
# HELP jgc_generational_classspace_size_after_collection_bytes class space size after collection
# TYPE jgc_generational_classspace_size_after_collection_bytes gauge
# HELP jgc_generational_free_phantom_references amount of free phantom references
# TYPE jgc_generational_free_phantom_references gauge
# HELP jgc_generational_nonclassspace_size_before_collection_bytes non-class space size before collection
# TYPE jgc_generational_nonclassspace_size_before_collection_bytes gauge
# HELP jgc_zgc_reclaimed_reclaim_end_bytes zgc reclaim end
# TYPE jgc_zgc_reclaimed_reclaim_end_bytes gauge
# HELP jgc_zgc_reclaimed_reclaim_start_bytes zgc reclaim start
# TYPE jgc_zgc_reclaimed_reclaim_start_bytes gauge
# HELP jgc_g1_archive_after_collection_regions amount of g1 archive regions after collection
# TYPE jgc_g1_archive_after_collection_regions gauge
jgc_g1_archive_after_collection_regions{path="/Users/momo/Desktop/g1gc.log",} 0.0
# HELP jgc_generational_heap_occupancy_after_collection_bytes heap occupancy after collection
# TYPE jgc_generational_heap_occupancy_after_collection_bytes gauge
# HELP jgc_generational_soft_reference_pause_duration_seconds soft reference pause duration
# TYPE jgc_generational_soft_reference_pause_duration_seconds summary
# HELP jgc_safepoint_block_duration_seconds safepoint block duration
# TYPE jgc_safepoint_block_duration_seconds summary
# HELP jgc_survivor_max_tenuring_threshold survivor max threshold to promote tenured generation
# TYPE jgc_survivor_max_tenuring_threshold gauge
# HELP jgc_g1_archive_before_collection_regions amount of g1 archive regions before collection
# TYPE jgc_g1_archive_before_collection_regions gauge
jgc_g1_archive_before_collection_regions{path="/Users/momo/Desktop/g1gc.log",} 0.0
# HELP jgc_g1_old_before_collection_regions amount of g1 old regions before collection
# TYPE jgc_g1_old_before_collection_regions gauge
jgc_g1_old_before_collection_regions{path="/Users/momo/Desktop/g1gc.log",} 341.0
# HELP jgc_zgc_5ms_mmu_ratio zgc 5ms mmu ratio
# TYPE jgc_zgc_5ms_mmu_ratio gauge
# HELP jgc_generational_soft_references amount of soft references
# TYPE jgc_generational_soft_references gauge
# HELP jgc_generational_weak_reference_pause_seconds weak reference pause duration
# TYPE jgc_generational_weak_reference_pause_seconds summary
# HELP jgc_zgc_mark_end_free_bytes zgc mark end free
# TYPE jgc_zgc_mark_end_free_bytes gauge
# HELP jgc_generational_tenured_occupancy_after_collection_bytes tenured generation occupancy after collection
# TYPE jgc_generational_tenured_occupancy_after_collection_bytes gauge
# HELP jgc_generational_nonclassspace_occupancy_after_collection_bytes non-class space occupancy after collection
# TYPE jgc_generational_nonclassspace_occupancy_after_collection_bytes gauge
# HELP jgc_safepoint_cleanup_duration_seconds safepoint cleanup duration
# TYPE jgc_safepoint_cleanup_duration_seconds summary
# HELP jgc_g1_meta_space_occupancy_after_collection_bytes meta space occupancy bytes after collection
# TYPE jgc_g1_meta_space_occupancy_after_collection_bytes gauge
jgc_g1_meta_space_occupancy_after_collection_bytes{path="/Users/momo/Desktop/g1gc.log",} 4.89951232E8
# HELP jgc_zgc_metaspace_used_bytes metaspace used memory
# TYPE jgc_zgc_metaspace_used_bytes gauge
# HELP jgc_generational_jni_weak_references amount of jni weak references
# TYPE jgc_generational_jni_weak_references gauge
# HELP jgc_g1_survivor_size_bytes survivor size
# TYPE jgc_g1_survivor_size_bytes gauge
# HELP jgc_g1_weak_references amount of g1 weak references
# TYPE jgc_g1_weak_references gauge
# HELP jgc_generational_young_occupancy_after_collection_bytes young generation occupancy after collection
# TYPE jgc_generational_young_occupancy_after_collection_bytes gauge
# HELP jgc_g1_weak_reference_pause_duration_seconds weak reference pause duration
# TYPE jgc_g1_weak_reference_pause_duration_seconds summary
# HELP jgc_zgc_metaspace_committed_bytes metaspace committed memory
# TYPE jgc_zgc_metaspace_committed_bytes gauge
# HELP jgc_generational_string_table_process_duration_seconds string table process duration
# TYPE jgc_generational_string_table_process_duration_seconds summary
# HELP jgc_generational_metaspace_size_before_collection_bytes metaspace size before collection
# TYPE jgc_generational_metaspace_size_before_collection_bytes gauge
# HELP jgc_zgc_relocate_end_free_bytes zgc relocate end free
# TYPE jgc_zgc_relocate_end_free_bytes gauge
# HELP jgc_safepoint_spin_duration_seconds safepoint spin duration
# TYPE jgc_safepoint_spin_duration_seconds summary
# HELP jgc_zgc_allocated_reclaim_start_bytes zgc allocated reclaim start
# TYPE jgc_zgc_allocated_reclaim_start_bytes gauge
# HELP jgc_generational_tenured_occupancy_before_collection_bytes tenured generation occupancy before collection
# TYPE jgc_generational_tenured_occupancy_before_collection_bytes gauge
# HELP jgc_generational_nonclassspace_occupancy_before_collection_bytes non-class space occupancy before collection
# TYPE jgc_generational_nonclassspace_occupancy_before_collection_bytes gauge
# HELP jgc_generational_symbol_and_string_table_process_seconds symbol and string table process duration
# TYPE jgc_generational_symbol_and_string_table_process_seconds summary
# HELP jgc_log_lines_total Number of process log lines
# TYPE jgc_log_lines_total counter
jgc_log_lines_total{path="/Users/momo/Desktop/g1gc.log",} 302.0
# HELP jgc_g1_jni_weak_references amount of g1 jni references
# TYPE jgc_g1_jni_weak_references gauge
# HELP jgc_generational_final_reference_pause_duration_seconds final reference pause duration
# TYPE jgc_generational_final_reference_pause_duration_seconds summary
# HELP jgc_zgc_mark_end_used_bytes zgc mark end used
# TYPE jgc_zgc_mark_end_used_bytes gauge
# HELP jgc_zgc_garbage_reclaim_end_bytes zgc garbage reclaim end
# TYPE jgc_zgc_garbage_reclaim_end_bytes gauge
# HELP jgc_generational_phantom_reference_pause_duration_seconds phantom reference pause duration
# TYPE jgc_generational_phantom_reference_pause_duration_seconds summary
# HELP jgc_zgc_memory_reclaim_end_bytes zgc memory reclaim end
# TYPE jgc_zgc_memory_reclaim_end_bytes gauge
# HELP jgc_g1_eden_assign_regions amount of g1 eden assign regions
# TYPE jgc_g1_eden_assign_regions gauge
jgc_g1_eden_assign_regions{path="/Users/momo/Desktop/g1gc.log",} 1140.0
# HELP jgc_zgc_pause_mark_start_duration_seconds zgc pause mark start duration
# TYPE jgc_zgc_pause_mark_start_duration_seconds summary
# HELP jgc_zgc_50ms_mmu_ratio zgc 50ms mmu ratio
# TYPE jgc_zgc_50ms_mmu_ratio gauge
# HELP jgc_generational_classspace_occupancy_before_collection_bytes class space occupancy before collection
# TYPE jgc_generational_classspace_occupancy_before_collection_bytes gauge
# HELP jgc_g1_final_references amount of g1 final references
# TYPE jgc_g1_final_references gauge
# HELP jgc_g1_metaspace_heap_occupancy_before_collection_bytes metaspace occupancy bytes before collection
# TYPE jgc_g1_metaspace_heap_occupancy_before_collection_bytes gauge
jgc_g1_metaspace_heap_occupancy_before_collection_bytes{path="/Users/momo/Desktop/g1gc.log",} 4.89951232E8
# HELP jgc_generational_tenured_size_before_collection_bytes tenured generation size before collection
# TYPE jgc_generational_tenured_size_before_collection_bytes gauge
# HELP jgc_g1_eden_size_before_collection_bytes eden size before collection
# TYPE jgc_g1_eden_size_before_collection_bytes gauge
# HELP jgc_g1_eden_after_collection_regions amount of g1 eden region after collection
# TYPE jgc_g1_eden_after_collection_regions gauge
jgc_g1_eden_after_collection_regions{path="/Users/momo/Desktop/g1gc.log",} 0.0
# HELP jgc_g1_eden_occupancy_after_collection_bytes eden occupancy bytes after collection
# TYPE jgc_g1_eden_occupancy_after_collection_bytes gauge
# HELP jgc_zgc_live_mark_end_bytes zgc live mark end
# TYPE jgc_zgc_live_mark_end_bytes gauge
# HELP jgc_g1_soft_reference_pause_duration_seconds soft reference pause duration
# TYPE jgc_g1_soft_reference_pause_duration_seconds summary
# HELP jgc_zgc_relocate_end_used_bytes zgc relocate end used
# TYPE jgc_zgc_relocate_end_used_bytes gauge
# HELP jgc_generational_final_references amount of final references
# TYPE jgc_generational_final_references gauge
# HELP jgc_survivor_desired_occupancy_after_collection_bytes survivor occupancy after collection
# TYPE jgc_survivor_desired_occupancy_after_collection_bytes gauge
# HELP jgc_generational_nonclassspace_size_after_collection_bytes non-class space size after collection
# TYPE jgc_generational_nonclassspace_size_after_collection_bytes gauge
# HELP jgc_generational_class_unloading_process_duration_seconds class unloading process time
# TYPE jgc_generational_class_unloading_process_duration_seconds summary
# HELP jgc_generational_weak_references amount of weak references
# TYPE jgc_generational_weak_references gauge
# HELP jgc_zgc_garbage_reclaim_start_heap_bytes zgc garbage reclaim start
# TYPE jgc_zgc_garbage_reclaim_start_heap_bytes gauge
# HELP jgc_zgc_relocate_start_used_bytes zgc relocate start used
# TYPE jgc_zgc_relocate_start_used_bytes gauge
# HELP jgc_safepoint_application_threads amount of application threads
# TYPE jgc_safepoint_application_threads gauge
# HELP jgc_event_duration_seconds Duration of gc event
# TYPE jgc_event_duration_seconds summary
jgc_event_duration_seconds_count{path="/Users/momo/Desktop/g1gc.log",category="YoungGC",} 1.0
jgc_event_duration_seconds_sum{path="/Users/momo/Desktop/g1gc.log",category="YoungGC",} 0.014334
# HELP jgc_g1_survivor_heap_occupancy_after_collection_bytes survivor heap occupancy bytes after collection
# TYPE jgc_g1_survivor_heap_occupancy_after_collection_bytes gauge
# HELP jgc_g1_humongous_before_collection_regions amount of g1 humongous regions before collection
# TYPE jgc_g1_humongous_before_collection_regions gauge
jgc_g1_humongous_before_collection_regions{path="/Users/momo/Desktop/g1gc.log",} 422.0
# HELP jgc_survivor_calculated_tenuring_threshold survivor threshold to promote tenured generation
# TYPE jgc_survivor_calculated_tenuring_threshold gauge
# HELP jgc_zgc_live_reclaim_end_bytes zgc live reclaim end
# TYPE jgc_zgc_live_reclaim_end_bytes gauge
# HELP jgc_real_cpu_seconds real cpu time
# TYPE jgc_real_cpu_seconds summary
jgc_real_cpu_seconds_count{path="/Users/momo/Desktop/g1gc.log",} 1.0
jgc_real_cpu_seconds_sum{path="/Users/momo/Desktop/g1gc.log",} 0.01
# HELP jgc_generational_heap_size_before_collection_bytes heap size before collection
# TYPE jgc_generational_heap_size_before_collection_bytes gauge
# HELP jgc_zgc_concurrent_mark_free_duration_seconds zgc concurrent mark free duration
# TYPE jgc_zgc_concurrent_mark_free_duration_seconds summary
# HELP jgc_zgc_100ms_mmu_ratio zgc 100ms mmu ratio
# TYPE jgc_zgc_100ms_mmu_ratio gauge
# HELP jgc_zgc_live_reclaim_start_bytes zgc live reclaim start
# TYPE jgc_zgc_live_reclaim_start_bytes gauge
# HELP jgc_zgc_process_non_strong_references_duration_seconds zgc process non-strong references duration
# TYPE jgc_zgc_process_non_strong_references_duration_seconds summary
# HELP jgc_zgc_15m_cpu_load zgc latest 15 minute cpu load average
# TYPE jgc_zgc_15m_cpu_load gauge
# HELP jgc_sys_cpu_seconds sys cpu time
# TYPE jgc_sys_cpu_seconds summary
jgc_sys_cpu_seconds_count{path="/Users/momo/Desktop/g1gc.log",} 1.0
jgc_sys_cpu_seconds_sum{path="/Users/momo/Desktop/g1gc.log",} 0.01
# HELP jgc_generational_young_size_after_collection_bytes young generation size after collection
# TYPE jgc_generational_young_size_after_collection_bytes gauge
# HELP jgc_zgc_concurrent_reset_relocationset_duration_seconds zgc concurrent reset relocationset duration
# TYPE jgc_zgc_concurrent_reset_relocationset_duration_seconds summary
# HELP jgc_g1_phantom_references amount of g1 phantom references
# TYPE jgc_g1_phantom_references gauge
# HELP jgc_g1_humongous_assign_regions amount of g1 humongous assign regions
# TYPE jgc_g1_humongous_assign_regions gauge
jgc_g1_humongous_assign_regions{path="/Users/momo/Desktop/g1gc.log",} 41.0
# HELP jgc_generational_classspace_size_before_collection_bytes class space size before collection
# TYPE jgc_generational_classspace_size_before_collection_bytes gauge
# HELP jgc_zgc_memory_reclaim_start_bytes zgc memory reclaim start
# TYPE jgc_zgc_memory_reclaim_start_bytes gauge
# HELP jgc_generational_symbol_table_process_duration_seconds symbol table process time
# TYPE jgc_generational_symbol_table_process_duration_seconds summary
# HELP jgc_g1_eden_size_after_collection_bytes eden size after collection
# TYPE jgc_g1_eden_size_after_collection_bytes gauge
# HELP jgc_g1_jni_weak_reference_pause_duration_seconds jni weak reference pause duration
# TYPE jgc_g1_jni_weak_reference_pause_duration_seconds summary
# HELP jgc_safepoint_vmop_duration_seconds safepoint vmop duration
# TYPE jgc_safepoint_vmop_duration_seconds summary
# HELP jgc_generational_metaspace_occupancy_after_collection_bytes metaspace occupancy after collection
# TYPE jgc_generational_metaspace_occupancy_after_collection_bytes gauge
# HELP jgc_g1_survivor_heap_occupancy_before_collection_bytes survivor heap occupancy bytes before collection
# TYPE jgc_g1_survivor_heap_occupancy_before_collection_bytes gauge
# HELP jgc_zgc_10ms_mmu_ratio zgc 10ms mmu ratio
# TYPE jgc_zgc_10ms_mmu_ratio gauge
# HELP jgc_zgc_garbage_mark_end_bytes zgc garbage mark end
# TYPE jgc_zgc_garbage_mark_end_bytes gauge
# HELP jgc_generational_heap_size_after_collection_bytes heap size after collection
# TYPE jgc_generational_heap_size_after_collection_bytes gauge
# HELP jgc_zgc_pause_mark_end_duration_seconds zgc concurrent mark end duration
# TYPE jgc_zgc_pause_mark_end_duration_seconds summary
# HELP jgc_safepoint_sync_duration_seconds safepoint sync duration
# TYPE jgc_safepoint_sync_duration_seconds summary
# HELP jgc_g1_survivor_assign_regions amount of g1 survivor assign regions
# TYPE jgc_g1_survivor_assign_regions gauge
jgc_g1_survivor_assign_regions{path="/Users/momo/Desktop/g1gc.log",} 144.0
# HELP jgc_generational_jni_weak_reference_pause_duration_seconds jni weak reference pause duration
# TYPE jgc_generational_jni_weak_reference_pause_duration_seconds summary
# HELP jgc_g1_metaspace_size_before_collection_bytes metaspace size bytes before collection
# TYPE jgc_g1_metaspace_size_before_collection_bytes gauge
jgc_g1_metaspace_size_before_collection_bytes{path="/Users/momo/Desktop/g1gc.log",} 4.9545216E8
# HELP jgc_user_cpu_seconds user cpu time
# TYPE jgc_user_cpu_seconds summary
jgc_user_cpu_seconds_count{path="/Users/momo/Desktop/g1gc.log",} 1.0
jgc_user_cpu_seconds_sum{path="/Users/momo/Desktop/g1gc.log",} 0.05
# HELP jgc_zgc_5m_cpu_load zgc latest 5 minute cpu load average
# TYPE jgc_zgc_5m_cpu_load gauge
# HELP jgc_zgc_mark_start_free_bytes zgc mark start free
# TYPE jgc_zgc_mark_start_free_bytes gauge
# HELP jgc_g1_eden_heap_occupancy_before_collection_bytes eden heap occupancy bytes before collection
# TYPE jgc_g1_eden_heap_occupancy_before_collection_bytes gauge

[juliusv]

👍 Thanks for the updates! Yeah that looks much better at a glance. I don't know anything about Java, but should be good to merge at least :)

[fstab]

Thanks for the new exporter @loyispa. This parses GC log files, right? I guess in that case it makes sense to have it as an independent exporter, because parsing GC log files doesn't really fit with client_java or jmx_exporter. However, if you ever have any plans for GC metrics via JMX or via JFR please contribute to client_java, contributions there are highly appreciated!

[loyispa]

@fstab Yes, It parses the raw gc log as an independent exporter. Thanks for the advice, I will consider how to implement it appropriately with client_java :)