D65 = A: the busy file the agent reads before an operator reboot, and the household's 'Felhom support restarted your box' line; R-1350: a hold clear records the wanted stop so no app_start_failed follows it

controller/internal/agentapi/operatorreboot.go

@@ -0,0 +1,33 @@
+package agentapi
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"time"
+)
+
+// OperatorReboot calls GET /guest/operator-reboot (D65 = A, agent ≥ the reboot_guest commit): the time the operator
+// rebooted THIS guest from the hub, when it is less than a day old; the zero time when there is none. An agent that
+// predates the route answers 404 (a *StatusError) — such an agent cannot reboot from the hub either, so there is
+// nothing to show and no MinAgent is needed.
+func (c *Client) OperatorReboot(ctx context.Context) (time.Time, error) {
+	body, err := c.get(ctx, "/guest/operator-reboot")
+	if err != nil {
+		return time.Time{}, err
+	}
+	var out struct {
+		At string `json:"at"`
+	}
+	if err := json.Unmarshal(body, &out); err != nil {
+		return time.Time{}, fmt.Errorf("agentapi: decode /guest/operator-reboot: %w", err)
+	}
+	if out.At == "" {
+		return time.Time{}, nil
+	}
+	at, err := time.Parse(time.RFC3339, out.At)
+	if err != nil {
+		return time.Time{}, fmt.Errorf("agentapi: /guest/operator-reboot: bad time %q", out.At)
+	}
+	return at, nil
+}