# Follow-up #10 / issue #456 — live proof that authored ResilienceConfig reaches the runtime pipeline

**Date:** 2026-07-15 · **Rig:** docker-dev (central-1 + central-2, MAIN cluster, Warm/2-node) built from source.

## What this proves

The #456 "sub-gap" worried that per-instance `DriverInstance.ResilienceConfig` never reaches the
runtime resilience pipeline (so it runs tier-defaults only). This is **disproven** — both by a new
regression test and by this live capture.

## Setup

Seeded on MAIN (SQL): an Equipment namespace `ns-res` + an `OpcUaClient` driver `drv-res` carrying a
**non-default** override:

```json
"ResilienceConfig": {"capabilityPolicies":{"Subscribe":{"retryCount":999}}}
```

`retryCount:999` is deliberately over the cap (100) so the parser emits an unmistakable clamp
diagnostic that echoes the authored value. Deployed headless: `POST /api/deployments` → Accepted
(deploymentId 80b4be3c…).

## Evidence

**1. The persisted deployment artifact bytes carry it** (`dbo.Deployment.ArtifactBlob`, 4055 bytes):
`CHARINDEX('ResilienceConfig') > 0` = YES, `CHARINDEX('999') > 0` = YES; the `drv-res` object slice
shows `…"DriverType":"OpcUaClient"…"DriverConfig":"…"…"Resil…"`.

**2. The runtime parsed + applied it — on BOTH redundancy nodes:**

```
central-1  [WRN] Driver resilience config for instance=drv-res type=OpcUaClient: Subscribe.retryCount 999 exceeds the cap (100); clamped.
central-1  [INF] DriverHost central-1:4053: spawned OpcUaClient driver drv-res (stub=False)
central-2  [WRN] Driver resilience config for instance=drv-res type=OpcUaClient: Subscribe.retryCount 999 exceeds the cap (100); clamped.
central-2  [INF] DriverHost central-2:4053: spawned OpcUaClient driver drv-res (stub=False)
```

The authored value `999` appears verbatim in the runtime log. If the artifact did not carry
`ResilienceConfig` (the feared sub-gap), `spec.ResilienceConfig` would be null, the parser would take
pure tier-defaults, and **no clamp diagnostic would fire**. The diagnostic firing = the authored
policy rode DB → ConfigComposer → artifact → DriverHostActor → DriverCapabilityInvokerFactory.Create →
DriverResilienceOptionsParser. This is arch-review follow-up #10 acceptance item 2 ("re-verify the
behavioral gate with a non-default policy"), verified live on both nodes.

## Regression guard

`ConfigComposerTests.ResilienceConfig_survives_ConfigComposer_to_ParseDriverInstances_round_trip`
(master 809e7886) proves the same composer→artifact→parse leg deterministically, guarding against a
future projection / `[JsonIgnore]` silently reverting authored policy to tier defaults.

## Still open (acceptance item 1)

The raw retry/breaker log line **on an actual driver fault** was NOT captured. It requires a
connect-then-fault-mid-flight trigger: the wrapped capability calls (`Subscribe`/`Discover`/`Write`)
only fire after a driver reaches **Connected** (`DriverInstanceActor` `ResubscribeDesired` runs on the
`Become(Connected)` transition), so a driver at a dead endpoint stays in Reconnecting and never
exercises the wrapped path. The reliable trigger is an **idempotent Write to a Connected-then-killed
driver** (LDAP-gated Client.CLI write) or an S7 dead-socket reconnect. The retry/breaker **behaviour**
is already proven deterministically (`CapabilityInvokerTests` retry, the pipeline-builder logging test,
`DriverCapabilityInvokerFactoryTests` override-applies-to-behaviour). This remaining line is
operator-confidence only.
