Create ContainerStoppedMetadata class (facebookresearch#521)

Summary:
Pull Request resolved: facebookresearch#521

Added `ContainerStoppedMetadata` class in order to provide more insights to improve the debugging efficiency.

For this task, we mainly focus on the metadata when a container stopped (normally or unexpectedly). `ContainerStoppedMetadata` will be an attribute of `ContainerInstance`.

Reviewed By: ziqih, zhuang-93

Differential Revision: D44940312

fbshipit-source-id: 092bb315f2775b2f96e92a58eddeaf8a570dae44

CHANGELOG.md

@@ -7,6 +7,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ## [Unreleased]
 ### Added
 - Integrate InsightsService with OneDockerService
+- Add ContainerStoppedMetadata
 ### Changed
 ### Removed
 

fbpcp/entity/container_instance.py

@@ -11,6 +11,7 @@
 from typing import Optional
 
 from dataclasses_json import dataclass_json
+from fbpcp.entity.container_metadata import ContainerStoppedMetadata
 from fbpcp.entity.container_permission import ContainerPermissionConfig
 
 
@@ -31,3 +32,4 @@ class ContainerInstance:
     memory: Optional[int] = None  # Memory in GB
     exit_code: Optional[int] = None
     permission: Optional[ContainerPermissionConfig] = None
+    stopped_metadata: Optional[ContainerStoppedMetadata] = None

fbpcp/entity/container_metadata.py

@@ -0,0 +1,16 @@
+#!/usr/bin/env python3
+# Copyright (c) Meta Platforms, Inc. and affiliates.
+#
+# This source code is licensed under the MIT license found in the
+# LICENSE file in the root directory of this source tree.
+
+# pyre-strict
+
+from dataclasses import dataclass
+
+
+@dataclass
+class ContainerStoppedMetadata:
+    stopped_at: str
+    stop_code: str
+    stopped_reason: str