+h3. Interruption notices
+
+When running a container on a spot instance, Arvados monitors the EC2 metadata endpoint for interruption notices. When an interruption notice is received, it is reported in a log entry in the @crunch-run.txt@ file as well as @warning@ and @preemptionNotice@ keys in the @runtime_status@ field of the affected container.
+
+Example excerpt from @crunch-run.txt@:
+
+<pre>
+2023-02-21T21:12:42.350719824Z Cloud provider scheduled instance stop at 2023-02-21T21:14:42Z
+</pre>
+
+Example @runtime_status@:
+
+<pre>
+{
+ "warning": "preemption notice",
+ "warningDetail": "Cloud provider scheduled instance stop at 2023-02-21T21:14:42Z",
+ "preemptionNotice": "Cloud provider scheduled instance stop at 2023-02-21T21:14:42Z"
+}
+</pre>
+