feat(logs): add unit to metric filter (#23608)

Allows attaching unit to a metric filter.

----

### All Submissions:

* [x] Have you followed the guidelines in our [Contributing guide?](https://github.com/aws/aws-cdk/blob/main/CONTRIBUTING.md)

### Adding new Construct Runtime Dependencies:

* [ ] This PR adds new construct runtime dependencies following the process described [here](https://github.com/aws/aws-cdk/blob/main/CONTRIBUTING.md/#adding-construct-runtime-dependencies)

### New Features

* [x] Have you added the new feature to an [integration test](https://github.com/aws/aws-cdk/blob/main/INTEGRATION_TESTS.md)?
	* [x] Did you use `yarn integ` to deploy the infrastructure and generate the snapshot (i.e. `yarn integ` without `--dry-run`)?

*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*

Author: msambol

packages/@aws-cdk/aws-logs/README.md

@@ -165,7 +165,8 @@ const mf = new logs.MetricFilter(this, 'MetricFilter', {
   metricValue: '$.latency',
   dimensions: {
     ErrorCode: '$.errorCode',
-  }
+  },
+  unit: Unit.MILLISECONDS,
 });
 
 //expose a metric from the metric filter

packages/@aws-cdk/aws-logs/lib/log-group.ts

@@ -545,4 +545,12 @@ export interface MetricFilterOptions {
    * @default - No dimensions attached to metrics.
    */
   readonly dimensions?: Record<string, string>;
+
+  /**
+   * The unit to assign to the metric.
+   *
+   * @see https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-properties-logs-metricfilter-metrictransformation.html#cfn-logs-metricfilter-metrictransformation-unit
+   * @default - No unit attached to metrics.
+   */
+  readonly unit?: cloudwatch.Unit;
 }

packages/@aws-cdk/aws-logs/lib/metric-filter.ts

@@ -49,6 +49,7 @@ export class MetricFilter extends Resource {
         metricValue: props.metricValue ?? '1',
         defaultValue: props.defaultValue,
         dimensions: props.dimensions ? Object.entries(props.dimensions).map(([key, value]) => ({ key, value })) : undefined,
+        unit: props.unit,
       }],
     });
   }

packages/@aws-cdk/aws-logs/test/integ.expose-metric.js.snapshot/aws-cdk-expose-metric-integ.assets.json

@@ -1,5 +1,5 @@
 {
-  "version": "20.0.0",
+  "version": "22.0.0",
   "files": {
     "eca17ca94625bc7a08a880410570afed5eecf3d9a01b6c401155caa073187adb": {
       "source": {

packages/@aws-cdk/aws-logs/test/integ.expose-metric.js.snapshot/cdk.out

@@ -1 +1 @@
-{"version":"20.0.0"}
+{"version":"22.0.0"}

packages/@aws-cdk/aws-logs/test/integ.expose-metric.js.snapshot/integ.json

@@ -1,5 +1,5 @@
 {
-  "version": "20.0.0",
+  "version": "22.0.0",
   "testCases": {
     "integ.expose-metric": {
       "stacks": [

packages/@aws-cdk/aws-logs/test/integ.expose-metric.js.snapshot/manifest.json

@@ -1,12 +1,6 @@
 {
-  "version": "20.0.0",
+  "version": "22.0.0",
   "artifacts": {
-    "Tree": {
-      "type": "cdk:tree",
-      "properties": {
-        "file": "tree.json"
-      }
-    },
     "aws-cdk-expose-metric-integ.assets": {
       "type": "cdk:asset-manifest",
       "properties": {
@@ -71,6 +65,12 @@
         ]
       },
       "displayName": "aws-cdk-expose-metric-integ"
+    },
+    "Tree": {
+      "type": "cdk:tree",
+      "properties": {
+        "file": "tree.json"
+      }
     }
   }
 }

packages/@aws-cdk/aws-logs/test/integ.expose-metric.js.snapshot/tree.json

@@ -4,14 +4,6 @@
     "id": "App",
     "path": "",
     "children": {
-      "Tree": {
-        "id": "Tree",
-        "path": "Tree",
-        "constructInfo": {
-          "fqn": "constructs.Construct",
-          "version": "10.1.85"
-        }
-      },
       "aws-cdk-expose-metric-integ": {
         "id": "aws-cdk-expose-metric-integ",
         "path": "aws-cdk-expose-metric-integ",
@@ -103,17 +95,41 @@
               "fqn": "@aws-cdk/aws-cloudwatch.Alarm",
               "version": "0.0.0"
             }
+          },
+          "BootstrapVersion": {
+            "id": "BootstrapVersion",
+            "path": "aws-cdk-expose-metric-integ/BootstrapVersion",
+            "constructInfo": {
+              "fqn": "@aws-cdk/core.CfnParameter",
+              "version": "0.0.0"
+            }
+          },
+          "CheckBootstrapVersion": {
+            "id": "CheckBootstrapVersion",
+            "path": "aws-cdk-expose-metric-integ/CheckBootstrapVersion",
+            "constructInfo": {
+              "fqn": "@aws-cdk/core.CfnRule",
+              "version": "0.0.0"
+            }
           }
         },
+        "constructInfo": {
+          "fqn": "@aws-cdk/core.Stack",
+          "version": "0.0.0"
+        }
+      },
+      "Tree": {
+        "id": "Tree",
+        "path": "Tree",
         "constructInfo": {
           "fqn": "constructs.Construct",
-          "version": "10.1.85"
+          "version": "10.1.189"
         }
       }
     },
     "constructInfo": {
-      "fqn": "constructs.Construct",
-      "version": "10.1.85"
+      "fqn": "@aws-cdk/core.App",
+      "version": "0.0.0"
     }
   }
 }

packages/@aws-cdk/aws-logs/test/integ.metricfilter-dimensions.js.snapshot/aws-cdk-metricfilter-dimensions-integ.assets.json

@@ -1,5 +1,5 @@
 {
-  "version": "21.0.0",
+  "version": "22.0.0",
   "files": {
     "3d99811cf4d8b2d453d889e936569b925ead97bdb93a86d122b34d68818be01d": {
       "source": {

packages/@aws-cdk/aws-logs/test/integ.metricfilter-dimensions.js.snapshot/cdk.out

@@ -1 +1 @@
-{"version":"21.0.0"}
+{"version":"22.0.0"}