add telemetry to StackManagementInfoProvider (#149)

* add telemetry to StackManagementInfoProvider

* use Measure instead of Track, move API measurement to CfnService, initialize value of count to 0

Author: Zee2413

src/resourceState/StackManagementInfoProvider.ts

@@ -1,6 +1,8 @@
 import { CloudFormationServiceException } from '@aws-sdk/client-cloudformation';
 import { CfnService } from '../services/CfnService';
 import { LoggerFactory } from '../telemetry/LoggerFactory';
+import { ScopedTelemetry } from '../telemetry/ScopedTelemetry';
+import { Telemetry, Measure } from '../telemetry/TelemetryDecorator';
 
 export type ResourceStackManagementResult = {
     physicalResourceId: string;
@@ -13,15 +15,23 @@ export type ResourceStackManagementResult = {
 const log = LoggerFactory.getLogger('StackManagementInfoProvider');
 
 export class StackManagementInfoProvider {
+    @Telemetry() private readonly telemetry!: ScopedTelemetry;
+
     constructor(private readonly cfnService: CfnService) {}
 
+    @Measure({ name: 'getResourceManagementState' })
     public async getResourceManagementState(physicalResourceId: string): Promise<ResourceStackManagementResult> {
+        this.telemetry.count('managed', 0);
+        this.telemetry.count('unmanaged', 0);
+        this.telemetry.count('unknown', 0);
+
         try {
             const description = await this.cfnService.describeStackResources({
                 PhysicalResourceId: physicalResourceId,
             });
             const firstObservedStackResource = description.StackResources?.at(0);
             if (firstObservedStackResource) {
+                this.telemetry.count('managed', 1);
                 return {
                     physicalResourceId: physicalResourceId,
                     managedByStack: true,
@@ -37,6 +47,7 @@ export class StackManagementInfoProvider {
                 error.message.includes(`Stack for ${physicalResourceId} does not exist`)
             ) {
                 log.info(error.message);
+                this.telemetry.count('unmanaged', 1);
                 return {
                     physicalResourceId: physicalResourceId,
                     managedByStack: false,
@@ -47,6 +58,7 @@ export class StackManagementInfoProvider {
         }
         const errMsg = 'Unexpected response from CloudFormation Describe Stack Resources with empty resource list';
         log.error(`DescribeStackResources for ${physicalResourceId} failed: ${errMsg}`);
+        this.telemetry.count('unknown', 1);
         return {
             physicalResourceId: physicalResourceId,
             managedByStack: undefined,

src/services/CfnService.ts

@@ -55,6 +55,7 @@ import {
     waitUntilStackDeleteComplete,
 } from '@aws-sdk/client-cloudformation';
 import { WaiterConfiguration, WaiterResult } from '@smithy/util-waiter';
+import { Measure } from '../telemetry/TelemetryDecorator';
 import { AwsClient } from './AwsClient';
 
 export class CfnService {
@@ -179,6 +180,7 @@ export class CfnService {
         });
     }
 
+    @Measure({ name: 'describeStackResources' })
     public async describeStackResources(params: {
         StackName?: string;
         LogicalResourceId?: string;