Remove unused import.

docker/scripts/graph_docker_memory.py

@@ -6,7 +6,7 @@ import logging
 import re
 import subprocess
 from dataclasses import dataclass
-from datetime import datetime, timedelta
+from datetime import datetime
 from time import sleep
 from typing import Collection, Final, NewType, Tuple
 
@@ -54,7 +54,7 @@ def main():
         write_plot(
             samples,
             labels,
-            horizontal_lines=[(32 * 1024**3, "red", "Cloud Run Max Memory")],
+            # horizontal_lines=[(32 * 1024**3, "red", "Cloud Run Max Memory")],
         )