v5.19.0

Changed

• Agent: a sampler for a capability the machine lacks now reports unsupported
  rather than failed, and rezolus status no longer exits non-zero because of
  it. A host whose CPU has no L3 cache domain, or which has no ROCm library or
  ethtool support, used to fail a readiness check over hardware it was never
  going to have. Monitoring that alerts on the status exit code will stop firing
  on such hosts; a genuine initialization failure still exits non-zero, and
  disabled, unsupported and failed are now three answers rather than two.
  (#1102, #1103)
• GPU: a Tegra SoC's integrated GPU no longer records utilization or PCIe link
  metrics. NVML answers both queries there and answers wrongly — a hard-coded
  0% utilization indistinguishable from a genuinely idle GPU once it is a row in
  an archive, and a placeholder generation and width for a link an iGPU does not
  have. gpu_sm_utilization, gpu_dram_bandwidth_utilization and the PCIe
  series are absent on those parts now rather than present and wrong. (#1108)
• Viewer/MCP: a query against a .rez archive is 12.8x faster. A query opens
  only the tables it touches, where before it materialized the whole archive and
  spent 91% of its wall time opening tables it never read. .rez is now at or
  ahead of a single parquet holding the same window. No format change — existing
  archives get this on read. (#1107)

Added

• Recorder: several endpoints record into one .rez. rezolus record --endpoint http://web-01:4241 --endpoint http://web-02:4241 -o fleet.rez writes one
  archive holding a recording per host, where before more than one endpoint
  silently demoted the output to parquet. Both arms of an A/B can now be
  captured concurrently rather than in sequence, so they share their background
  load instead of differing in it as well as in the experiment. (#1109)
• Packaging: .rpm packages for Enterprise Linux 10, and the install script now
  accepts Rocky Linux, AlmaLinux, RHEL, CentOS Stream and Oracle Linux at major
  9 or 10. curl -fsSL https://install.rezolus.com | sudo bash failed outright
  on EL10 before. (#1113)

Fixed

• Recording: reading a .rez while it is being written no longer panics when
  retention evicts a table mid-query. A quiet sampler's only rows could be
  dropped between the probe that named its table and the query that opened it,
  crashing the viewer or MCP against a hindsight rolling buffer — which is the
  one thing that buffer exists to be read as. A table that has gone is reported
  absent, the same as one that was never there. (#1112)
• Recording: a Prometheus source that emits timestamps no longer writes
  acquisition windows anchored decades before the rows holding them. The
  optional trailing timestamp in the exposition format is a federation staleness
  marker, not a claim about when we read; taking it at face value gave a row
  recorded in 2026 a window one second after the Unix epoch — a ~56-year error
  in the operand rate() prices its uncertainty from, nonsense rather than
  conservative. The window is our fetch. Any pushgateway or federation exporter
  produced this, on the parquet path as well as .rez. (#1111)