From e5127395713c5cde6f2dc8d9ee16f6d5dd356198 Mon Sep 17 00:00:00 2001
From: Jaanus Sellin <sellinjaanus@gmail.com>
Date: Wed, 2 Oct 2024 15:49:15 +0300
Subject: [PATCH] feat: add logging for lifecycle prom metrics (#8341)

---
 .../feature-lifecycle/feature-lifecycle-service.ts       | 9 +++++++++
 src/lib/metrics.ts                                       | 3 +++
 src/lib/types/experimental.ts                            | 7 ++++++-
 3 files changed, 18 insertions(+), 1 deletion(-)

diff --git a/src/lib/features/feature-lifecycle/feature-lifecycle-service.ts b/src/lib/features/feature-lifecycle/feature-lifecycle-service.ts
index dd0f8d8865..2d05c58089 100644
--- a/src/lib/features/feature-lifecycle/feature-lifecycle-service.ts
+++ b/src/lib/features/feature-lifecycle/feature-lifecycle-service.ts
@@ -132,8 +132,17 @@ export class FeatureLifecycleService {
     }
 
     private recordStagesEntered(newlyEnteredStages: NewStage[]) {
+        if (this.flagResolver.isEnabled('trackLifecycleMetrics')) {
+            this.logger.info(
+                'recordStagesEntered parameter',
+                newlyEnteredStages,
+            );
+        }
         newlyEnteredStages.forEach(({ stage, feature }) => {
             this.eventBus.emit(STAGE_ENTERED, { stage, feature });
+            if (this.flagResolver.isEnabled('trackLifecycleMetrics')) {
+                this.logger.info('STAGE_ENTERED emitted', { stage, feature });
+            }
         });
     }
 
diff --git a/src/lib/metrics.ts b/src/lib/metrics.ts
index d724fb44ab..25c1ab8557 100644
--- a/src/lib/metrics.ts
+++ b/src/lib/metrics.ts
@@ -453,6 +453,9 @@ export default class MetricsMonitor {
                 eventBus.on(
                     events.STAGE_ENTERED,
                     (entered: { stage: string; feature: string }) => {
+                        if (flagResolver.isEnabled('trackLifecycleMetrics')) {
+                            logger.info('STAGE_ENTERED listened', entered);
+                        }
                         featureLifecycleStageEnteredCounter.increment({
                             stage: entered.stage,
                         });
diff --git a/src/lib/types/experimental.ts b/src/lib/types/experimental.ts
index 9df11056bc..ad6994d28a 100644
--- a/src/lib/types/experimental.ts
+++ b/src/lib/types/experimental.ts
@@ -60,7 +60,8 @@ export type IFlagKey =
     | 'onboardingUI'
     | 'projectRoleAssignment'
     | 'eventTimeline'
-    | 'personalDashboardUI';
+    | 'personalDashboardUI'
+    | 'trackLifecycleMetrics';
 
 export type IFlags = Partial<{ [key in IFlagKey]: boolean | Variant }>;
 
@@ -297,6 +298,10 @@ const flags: IFlags = {
         process.env.UNLEASH_EXPERIMENTAL_PERSONAL_DASHBOARD_UI,
         false,
     ),
+    trackLifecycleMetrics: parseEnvVarBoolean(
+        process.env.UNLEASH_EXPERIMENTAL_TRACK_LIFECYCLE_METRICS,
+        false,
+    ),
 };
 
 export const defaultExperimentalOptions: IExperimentalOptions = {