v4.1.1

Fixed

• Fixed packaging workflow so DEB and RPM artifacts are published. (#365)

v4.1.0

Added

• rezolus-recorder which can connect to a running Rezolus instance and record
  metrics into a parquet file. (#356)

Fixed

• Configured listen address was ignored and a default was used. (#362)

v4.0.0

Changed

• All samplers are now async and run on-demand when a metrics endpoint is hit.
  Percentiles must now be calculated from the free-running histograms. (#334)
• BPF is now non-optional on Linux. (#336)
• Makes HTTP compression dependent on client accept headers, removes the need
  for separate configuration of compression. (#337)
• Removes histograms for counter and gauge metrics. (#338)
• Histogram grouping power reduced from 7 (0.781% error) to 3 (12.5% error).
  This reduces the memory footprint for each histogram. (#339)

Added

• Syscall samplers now track yield syscall. (#310)
• TCP active open (connect) latency now tracked. (#342)

v3.18.1

Changed

• Ubuntu Bionic dropped from packaging job. (#306)

v3.18.0

Fixed

• CPU per core cycle and instruction counters were incorrect. The system totals
  reflected the appropriate value. (#304)

Added

• Allow setting the metric snapshot interval to better address cases where
  metrics are not scraped on a secondly basis. (#286)
• Network carrier change metric. (#290)

Changed

• Explicitly use relaxed atomics in BPF samplers. (#276)
• Split syscall sampler into syscall_latency and syscall_counts to allow more
  fine-grained configuration and allow for reduced overhead. (#298)
• Split block_io latency sampler into block_io_latency and block_io_requests to
  allow more fine-grained configuration and allow for reduced overhead. (#299)

v3.17.0

Fixed

• Fixes sampler configuration inheritance for partially defined sampler config
  sections (#273)
• Linux BPF CPU usage sampler had idle time metric counting backwards (#281)

Added

• Fallback for linux network traffic sampler to get metrics from sysfs when BPF
  is not enabled or fails to initialize (#274)
• JSON stats endpoints (#277)

v3.16.0

Fixed

• Listen address could not be changed (#264)

Added

• CPU busy time metric for non-Prometheus endpoints (#256)

v3.15.0

Fixed

• CPU usage sampler could not be disabled (#259)
• Example config out-of-date (#260)

Added

• Example Grafana/Prometheus dashboard (#239)
• Off-CPU time added to the scheduler runqueue sampler (#240)
• Filesystem sampler added and tracks the number of open file descriptors (#242)
• Log level can now be set in the config (#246)
• Network interface statistics for tx/rx errors (drop, crc, ...) (#247)
• BPF can be enabled/disabled per-sampler or globally. (#258)

v3.14.2

Fixed

• CPU usage for soft and hard irq was incorrectly reported. (#236)

v3.14.1

Fixed

• CPU usage reporting via BPF would report CPU as always idle on some systems.
  (#233)