v0.33.0

Changed

• Breaking Change: Datadog blackhole now records received series under the
  target/ prefix, matching the prometheus and expvar target metrics
  collectors. The record policy still matches on the unprefixed series name.
• Breaking Change: Datadog blackhole does not record any target metrics by
  default.

Added

• Datadog blackhole now accepts a record policy (all / disabled /
  series_to_keep: [...]) controlling which received series are recorded as
  capture metrics.
• OpenTelemetry metric payloads now prefix generated metric names with their
  metric kind to simplify intake debugging.
• OpenTelemetry cumulative metric generation now updates cumulative sums using
  aggregation temporality, preserves cumulative histogram min/max bounds, and
  supports configurable histogram count limits. Cumulative explicit histograms
  now retain their state across payload generations.
• HTTP blackhole now supports an openmetrics body variant for generated
  Prometheus/OpenMetrics scrape responses.
• Updated to rand 0.10.x
• dogstatsd generator now supports configurable pools for the |c: (container
  ID), |e: (external data), and |card: (cardinality) origin detection
  extension fields via the new container_ids, external_data, and
  cardinality config options. Each field randomly selects from its pool per
  metric, or omits the field entirely if the pool is empty.
• dogstatsd generator now supports DogStatsD protocol v1.3 |T timestamps
  for count and gauge metrics via timestamp.range and timestamp.probability.

Fixed

• dogstatsd tag generation would silently fail with a misleading
  StringGenerate error for any tag_length whose range collapses after
  reserving one byte for the : separator -- every constant or single-value
  range (e.g. Constant(3), Constant(4), Inclusive { min: 100, max: 100 })
  as well as any end at or below the minimum tag length. The wrapper now
  validates tag_length upfront and, through the public DogStatsD::new path,
  returns a Validation error naming the offending range instead of the opaque
  StringGenerate.

Removed

• Removed no longer used smaps.private_hugetlb.by_pathname procfs observer
  metric.
• Removed no longer used smaps.swap_pss.by_pathname procfs observer metric.
• Removed no longer used smaps.swap.by_pathname procfs observer metric.
• Removed no longer used smaps.shared_hugetlb.by_pathname procfs observer
  metric.