v5.20.0

Added

• Viewer: stretches of time the producer never observed are drawn as a dashed,
  band-less segment rather than in the same ink as measured data. rate()
  across a hole has a value but no honest uncertainty bound, and was previously
  indistinguishable from a real point. Applies to both the display and matrix
  paths, and per-capture in A/B compare. (#1193, #1199)
• Viewer: the compare badge lists every capture in an N-way comparison, not
  just the first two. (#1172)

Changed

• cgroup_cpu_bandwidth_quota and cgroup_cpu_bandwidth_period now report
  real values instead of 0. The tg_set_cfs_bandwidth kprobe read PARM2
  as a pointer when the kernel passes a u64, which faulted on modern kernels.
  Anything that encoded the zero — a dashboard panel, an alert threshold — will
  see these series move. The sampler also gains fentry twins, with the kprobes
  kept as the CO-RE-only fallback. (#1166, #1168)
• An unwritten counter-group entry now reads as absent rather than zero, so
  a sampler that populates part of a group no longer publishes phantom zero
  series for the rest. Externally-backed (BPF mmap) groups are deliberately
  unaffected: that memory is kernel zero-filled and cannot carry a sentinel.
  (#1188, #1190)
• Debian 11 packages are no longer published. The distribution is end-of-life.
  (#1179)
• Dependencies: metriken 0.11.0, metriken-exposition 0.20.0,
  metriken-query 0.23.0, plus 11 routine updates. (#1174, #1188, #1190)

Fixed

• Viewer: a single hole no longer strips the uncertainty band from an entire
  decimated series. (#1193)