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Java

Setup

The following are the two popular exporters for Java JVM Metrics JMX Exporter or Micrometer Prometheus Exporter. The Micrometer exporter provides more information and is the recommended option.

Metrics and Key Performance Indicators (KPI)s

Metric
KPI
GC Count
jvm_gc_pause_seconds_count
Rate of GC Count
rate(jvm_gc_pause_seconds_count{action="end of major GC"}[2m])
GC Pause Time
jvm_gc_pause_seconds_sum
Rate of GC Pause Time
rate(jvm_gc_pause_seconds_sum{action="end of major GC"}[2m])
Live Thread Count
jvm_threads_live_threads
Live thread count normalized against a threshold
jvm_threads_live_threads / 200

Alerts

KPI
Alert
Rate of GC Count
JvmMajorGCCountHigh
Rate of GC Pause Time
JvmMajorGCTimeHigh
Live Thread Count
Saturation on jvm:live_threads

Dashboard

CPU

  • system_cpu_usage
  • process_cpu_usage
  • system_cpu_count
  • system_load_average_1m

Heap Memory

The following heap metrics are available for Eden Space, Survivor Space and Tenured Generation
  • jvm_memory_used_bytes{area="heap"}
  • jvm_memory_committed_bytes{area="heap"}
  • jvm_memory_max_bytes{area="heap"}

Non Heap Memory

The following non heap metrics are available for Metaspace, Compressed Class Space and Code Cache
  • jvm_memory_used_bytes{area="nonheap"}
  • jvm_memory_committed_bytes{area="nonheap"}
  • jvm_memory_max_bytes{area="nonheap"}

Buffer Pools

The following metrics are available for Direct and Mapped buffers
  • jvm_buffer_total_capacity_bytes
  • jvm_buffer_memory_used_bytes
  • jvm_buffer_count_buffers

Threads

  • jvm_threads_live_threads
  • jvm_threads_daemon_threads
  • jvm_threads_peak_threads
  • process_threads
  • jvm_threads_states_threads

File Descriptors

  • process_files_open_files
  • process_files_max_files

Classes Loaded

  • jvm_classes_loaded_classes