release v2.11.0

Added

• Nvidia GPU sampler which uses the Nvidia Management Library (NVML) to gather
  telemetry for GPU utilization and health.
• NTP sampler to gather telemetry about NTP synchronization.

Fixed

• Disk BPF sampling now compatible with newer kernels.
• Bug introduced in 2.8.0 caused sample rates greater than 1000ms to cause
  errors.

release v2.10.0

Changed

• Updates tokio to 0.3.1 from 0.2.x
• Reduces syscall load by reusing filehandles in memory, interupt, and network
  samplers.

release v2.9.0

Added

• Page Cache sampler which uses BPF to instrument Page Cache hit/miss.

Fixed

• Updated rustcommon dependencies to get some runtime performance benefits.
• Added proper core -> NUMA node mapping to address issues with per-node metrics
  for interrupt sampler.
• Reduce the cost of disabled samplers by skipping all initialization of
  samplers which are not enabled in the config.
• Documentation updates.

release v2.8.0

Changed

• Metrics library has been replaced with a new version which reduces memory
  footprint.
• Samplers have been optimized to reduce number of system calls and temporary
  allocations.
• Arbitrary percentiles may now be expressed in the configuration.
• Percentile exposition format has changed to allow arbitrary percentiles. They
  are now expressed in a decimal format padded to 2 digits before the decimal.
  For example, the 5th percentile is now p05 and the 99.9th percentile is now
  p99.9.

release v2.7.1

Fixed

• Fixed memcache sampler causing tokio worker to panic due to issues registering
  the tcp stream with the tokio runtime.

release v2.7.0

Changed

• Perf event sampling now implemented with BPF. Now requires building with BPF
  support.
• Renamed worker threads and set limit for total number of runtime threads
  instead of just core threads.

Added

• CPU sampler now includes CPU frequency.

Fixed

• BPF probes are now dropped properly on program termination. Previously, on
  some kernel versions, BPF probes might remain after exit.
• Memcache sampler was not being initialized. It's now re-enabled.

release v2.6.0

Added

• Expanded memory sampler coverage to include telemetry related to NUMA access
  patterns, transparent hugepages, and compaction.

Fixed

• Disk sampler was not reporting stats for all disks on some multi-disk systems.

release v2.5.0

Added

• Interrupt sampler now has BPF sampling of time distribution of hardirq/softirq
  handlers.

Fixed

• Replaced remaining uses of chashmap with dashmap which has better performance
  characteristics.
• Statically linking bcc/bpf has fixes in upstream crates.

release v2.4.0

Added

• HTTP sampler to poll JSON endpoint and provide summary metrics
• Added support for bcc 0.15.0, making it the new default version

release v2.3.0

Added

• TCP abort metrics added to tcp sampler
• Increased max for context switch histogram to prevent clipping

Fixed

• Fixed bug where percentiles could get stuck at the max value if they hit it