chore(mo1_bragg): temporary ACS GETVAR interval debug logging

debye_bec/devices/mo1_bragg/acs.py

@@ -115,6 +115,7 @@ class AcsSignal(SocketSignal):
         self.enum = enum
         self.cache_ttl = cache_ttl
         self._last_hw_read: float | None = None
+        self.last_get = time.time()  # required by the interval debug log in _socket_get
         super().__init__(*args, **kwargs)
 
     @property
@@ -170,6 +171,16 @@ class AcsSignal(SocketSignal):
         return old_value == new_value
 
     def _socket_get(self):
+        now = time.time()
+        interval = now - self.last_get
+        self.last_get = now
+        # "[acs-cache]" marks the NEW cached implementation in the logs; the old acs.py
+        # logs "Get signal with tag ..." on every read, so the prefix proves which code
+        # the device server actually imported
+        logger.info(
+            f"[acs-cache] hardware GETVAR tag {self.tag}, {interval * 1e3:.1f} ms since last read"
+        )
+
         def convert(val):
             return self.enum(val).name if self.enum is not None else val