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perf(mtconnect): headers-only connectivity probe (R06:T-7)

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The connectivity probe parsed the full /probe device model every 5 s and discarded
it. It now calls a new IMTConnectAgentClient.PingAsync: one GET /probe read with
ResponseHeadersRead and a status check; the body is dropped unread. Same failure
surface as ProbeAsync (the default implementation delegates to it). The probe-tick
tests now count pings and pin that no tick issues a full /probe; the shutdown
test's absence assertion gained a positive control.

Refs #743

Claude-Session: https://claude.ai/code/session_01Ub9hGmYLQvn9XETzw7CMsT
This commit is contained in:
Joseph Doherty
2026-10-22 15:57:43 -04:00
parent f05e3bf6f4
commit d4b9fa1c29
7 changed files with 105 additions and 19 deletions
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docs/drivers/MTConnect.md
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@@ -90,7 +90,7 @@ request/response handshake — is a different mechanism and remains deferred; se
| `IReadable` | `ReadAsync` → the live `/sample` pump's index while it is delivering and healthy, else one `/current` per call | **Not the production data path** — see below |
| `IWritable` | `WriteAsync` → `POST {agent}/{device}?{dataItemId}={value}` on the Agent's `AllowPut` surface | **Off by default** — needs `Write.Enabled` **and** the Agent's `AllowPut`; CONDITION items are refused |
| `ISubscribable` | `SubscribeAsync`/`OnDataChange` — the shared `/sample` long-poll pump | **The production data path** |
| `IHostConnectivityProbe` | periodic `/probe` under `Probe.*` | No consumer wires it today — see [Known limitations](#known-limitations) |
| `IHostConnectivityProbe` | periodic headers-only `/probe` ping under `Probe.*` — the status is read, the device model is neither downloaded in full nor parsed (review 2026-10-21 T-7; it used to parse the whole model every tick) | Consumed — feeds `/hosts` (see [Known limitations](#known-limitations)) |
| `IRediscoverable` | watches the Agent's `Header.instanceId` | No consumer wires it today — see [Known limitations](#known-limitations) |
| `IDriverDiagnostics` | `GetDiagnostics()` — `/sample` effective count, lag, saturated chunks, count raises | Shown on `/hosts` (review 2026-10-21 T-5) |
| `IAlarmSource` | CONDITION observations off the same `/sample` pump → Part 9 transitions keyed by the alarm tag's RawPath | Opt-in per raw tag (`alarm` object) — see [CONDITION alarms](#condition-alarms-626) |