From 523225d6e92c7ba0cd811af9ba65e1fc19e75f67 Mon Sep 17 00:00:00 2001
From: Ivan-Lukianov <86720733+Ivan-Lukianov@users.noreply.github.com>
Date: Sat, 13 May 2023 21:08:51 +0400
Subject: [PATCH] Autoscaling: Add metrics for E2 target tracking scaling
 (#6314)

---
 moto/autoscaling/responses.py              | 32 +++++++++++++
 tests/test_autoscaling/test_autoscaling.py | 54 ++++++++++++++++++++++
 2 files changed, 86 insertions(+)

diff --git a/moto/autoscaling/responses.py b/moto/autoscaling/responses.py
index e6faab3ba..a209cea55 100644
--- a/moto/autoscaling/responses.py
+++ b/moto/autoscaling/responses.py
@@ -1022,6 +1022,38 @@ DESCRIBE_SCALING_POLICIES_TEMPLATE = """<DescribePoliciesResponse xmlns="http://
               {% if policy.target_tracking_config["CustomizedMetricSpecification"].get("Unit") %}
               <Unit>{{ policy.target_tracking_config["CustomizedMetricSpecification"].get("Unit") }}</Unit>
               {% endif %}
+              {% if policy.target_tracking_config["CustomizedMetricSpecification"].get("Metrics") %}
+              <Metrics>
+                {% for metric in policy.target_tracking_config["CustomizedMetricSpecification"].get("Metrics", []) %}
+                <member>
+                  <Id>{{ metric.get("Id") }}</Id>
+                  {% if metric.get("MetricStat") is none %}
+                  <Expression>{{ metric.get("Expression") }}</Expression>
+                  {% endif %}
+                  {% if metric.get("Expression") is none %}
+                  <MetricStat>
+                    <Metric>
+                      <Namespace>{{ metric.get("MetricStat", {}).get("Metric", {}).get("Namespace") }}</Namespace>
+                      <MetricName>{{ metric.get("MetricStat", {}).get("Metric", {}).get("MetricName") }}</MetricName>
+                      <Dimensions>
+                      {% for dim in metric.get("MetricStat", {}).get("Metric", {}).get("Dimensions", []) %}
+                        <member>
+                          <Name>{{ dim.get("Name") }}</Name>
+                          <Value>{{ dim.get("Value") }}</Value>
+                        </member>
+                      {% endfor %}
+                      </Dimensions>
+                    </Metric>
+                    <Stat>{{ metric.get("MetricStat", {}).get("Stat") }}</Stat>
+                    <Unit>{{ metric.get("MetricStat", {}).get("Unit") }}</Unit>
+                  </MetricStat>
+                  {% endif %}
+                  <Label>{{ metric.get("Label") }}</Label>
+                  <ReturnData>{{ 'true' if metric.get("ReturnData") is none else metric.get("ReturnData") }}</ReturnData>
+                </member>
+                {% endfor %}
+              </Metrics>
+              {% endif %}
             </CustomizedMetricSpecification>
             {% endif %}
             <TargetValue>{{ policy.target_tracking_config.get("TargetValue") }}</TargetValue>
diff --git a/tests/test_autoscaling/test_autoscaling.py b/tests/test_autoscaling/test_autoscaling.py
index 293c66159..8e4fade10 100644
--- a/tests/test_autoscaling/test_autoscaling.py
+++ b/tests/test_autoscaling/test_autoscaling.py
@@ -771,6 +771,30 @@ def test_create_autoscaling_policy_with_policytype__targettrackingscaling():
                 "PredefinedMetricType": "ASGAverageNetworkIn",
             },
             "TargetValue": 1000000.0,
+            "CustomizedMetricSpecification": {
+                "Metrics": [
+                    {
+                        "Label": "Get ASGAverageCPUUtilization",
+                        "Id": "cpu",
+                        "MetricStat": {
+                            "Metric": {
+                                "MetricName": "CPUUtilization",
+                                "Namespace": "AWS/EC2",
+                                "Dimensions": [
+                                    {"Name": "AutoScalingGroupName", "Value": asg_name}
+                                ],
+                            },
+                            "Stat": "Average",
+                        },
+                        "ReturnData": False,
+                    },
+                    {
+                        "Label": "Calculate square cpu",
+                        "Id": "load",
+                        "Expression": "cpu^2",
+                    },
+                ],
+            },
         },
     )
 
@@ -786,6 +810,36 @@ def test_create_autoscaling_policy_with_policytype__targettrackingscaling():
             "PredefinedMetricSpecification": {
                 "PredefinedMetricType": "ASGAverageNetworkIn",
             },
+            "CustomizedMetricSpecification": {
+                "MetricName": "None",
+                "Namespace": "None",
+                "Dimensions": [],
+                "Statistic": "None",
+                "Metrics": [
+                    {
+                        "Label": "Get ASGAverageCPUUtilization",
+                        "Id": "cpu",
+                        "MetricStat": {
+                            "Metric": {
+                                "MetricName": "CPUUtilization",
+                                "Namespace": "AWS/EC2",
+                                "Dimensions": [
+                                    {"Name": "AutoScalingGroupName", "Value": asg_name}
+                                ],
+                            },
+                            "Stat": "Average",
+                            "Unit": "None",
+                        },
+                        "ReturnData": False,
+                    },
+                    {
+                        "Label": "Calculate square cpu",
+                        "Id": "load",
+                        "Expression": "cpu^2",
+                        "ReturnData": True,
+                    },
+                ],
+            },
             "TargetValue": 1000000.0,
         }
     )