docs(gateway): document restart acknowledgement default

CHANGELOG.md

@@ -151,6 +151,7 @@ Docs: https://docs.openclaw.ai
 - Agents/Pi: honor explicit `strict-agentic` execution contracts for incomplete-turn retry guards across providers, so manually opted-in local or compatible models get the same retry behavior without relying on OpenAI model inference. (#66750) Thanks @ziomancer.
 - OpenShell/sandbox: pin verified file reads to an already-opened descriptor, walk the ancestor chain for symlinked parents on platforms without fd-path readlink, and re-check file identity so parent symlink swaps cannot redirect in-sandbox reads to host files outside the allowed mount root. (#69798) Thanks @drobison00.
 - Gateway/Control UI: require authenticated Control UI read access before serving `/__openclaw/control-ui-config.json` when `gateway.auth` is enabled, so unauthenticated callers can no longer read bootstrap metadata. (#70247) Thanks @drobison00.
+- Gateway/restart: default session-scoped restart sentinels to a one-shot agent continuation, so chat-initiated Gateway restarts acknowledge successful boot automatically. (#70269) Thanks @obviyus.
 
 ## 2026.4.21
 

docs/gateway/configuration.md

@@ -606,6 +606,10 @@ then `config.patch`.
     - `note` (optional) — note for the restart sentinel
     - `restartDelayMs` (optional) — delay before restart (default 2000)
 
+    When `sessionKey` is present and no explicit continuation is provided, the
+    Gateway asks that session's agent to acknowledge the successful restart
+    after boot.
+
     Restart requests are coalesced while one is already pending/in-flight, and a 30-second cooldown applies between restart cycles.
 
     ```bash