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docs: record completed Linux OPC UA lifecycle diagnostic
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Joseph Doherty
2026-11-10 20:28:11 -05:00
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docs/plans/evidence/2026-11-10-opcua2/late-slope-linux.json
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{
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docs/plans/evidence/2026-11-10-opcua2/late-slope-linux.md
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# Linux canonical late-slope diagnostic — completed, no cold-cap breach
One fixed Linux ARM64 diagnostic ran from source
`b18f97236a033b54945b3b9a1d5e306e11e278a7` with OPC UA SDK 2.0.1,
HistorianGateway Client/Contracts 1.0.0 and the pinned self-contained .NET 10.0.14
runtime. The runtime mapping, descriptor controls (2/2), workload (1/1),
shutdown and removal of the task-owned container were verified. The canonical
phase completed **7,201.014 seconds, 1,937 cycles and 484 restarts**. The workload,
container and launcher exited 0. The diagnostic receipt explicitly reports
`acceptance=false`.
No resource assertion latched. Cycle 3 set the original RSS baseline at
225,640,448 bytes (215.19 MiB); the unchanged +128 MiB limit was 359,858,176
bytes (343.19 MiB). The observed quiescent peak was 355,459,072 bytes
(338.99 MiB) at cycle 251 / 929.817 seconds, **4.20 MiB below the limit**.
Retained managed memory peaked at 20,410,640 bytes against its cycle-3
19,923,288-byte baseline; total descriptors peaked at 195 against a baseline of
191. All 1,937 quiescent samples had zero PKI descriptors and zero live
session/subscription/continuation/monitored-item inventories.
| Fixed window (minutes) | Samples | Median RSS (MiB) | Min–max RSS (MiB) | Median retained managed (MiB) |
|---|---:|---:|---:|---:|
| 30–40 | 162 | 316.35 | 310.81–321.04 | 19.02 |
| 60–70 | 162 | 317.03 | 309.78–321.66 | 19.10 |
| 110–120 | 160 | 317.20 | 313.43–320.18 | 19.05 |
Ordinary least squares over all 1,452 quiescent observations from 1,800 through
7,200 seconds yields **+203,355 RSS bytes/hour (+0.194 MiB/hour)** and
**+52,381 retained managed bytes/hour (+0.050 MiB/hour)**. The largest gap
between those observations was 7.641 seconds. At 1,800 seconds, 484 cycles and
121 restarts had completed, exceeding the earlier restart-step work count
without asserting new trace readiness.
This is evidence that sampled RSS largely leveled off after startup in this
**one** tracked Linux run. It does not identify which components own all RSS,
bound unsampled transient peaks, prove that growth can never recur, or supersede
the earlier Linux cold failures. No EventPipe observer was attached; certificate
allocation stack tracking and per-cycle quiescent GC remained enabled. This is
not uninstrumented resource acceptance, a matched SDK1/SDK2 comparison, or a
resolution of macOS native import retention. The original cold cap remains
binding; no warmed-baseline rule was adopted. Issue #799 and G4 remain open.
The [selected receipt](late-slope-linux.json) retains exact identities, raw
evidence hashes, exit statuses, window statistics and sample counts. The
[rehearsal](late-slope-rehearsal.json) and its earlier failure remain separate.