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Analytics Message: "Cannot get flag for unregistered flag. SDK name, flag name: app_measurement, session_stitching_token_feature_enabled" #10940

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@SKuhlemann

Description

@SKuhlemann

Description

When I create a new Xcode Project with an SwiftUI lifecycle and follow the integration tutorial for Firebase Analytics then I always see the following Debugger message multiple times.
For example when the app goes into inactive or background scenephase:
MyApp[4010:1178178] 10.6.0 - [FirebaseAnalytics][I-ACS800014] Cannot get flag for unregistered flag. SDK name, flag name: app_measurement, session_stitching_token_feature_enabled

This happens on simulator and real devices.

I added "-ObjC" as "Other Linking flags" for the target in XCode.
I also have Background modes enabled for the target:

  • Background fetch
  • Remote notifications
  • Background processing

Below I attached the logging in debugging mode, but the above message also appear in "normal" logging mode.
I dont't see any problems with FirebaseAnalytics and everything seems to be logged fine when taking a look into the Firebase console on the website.
Nevertheless this message makes me suspicious that something is wrong.

Kind regards
Stefan

Reproducing the issue

  • Create a new XCode project
  • Follow the instruction tutorial form Firebase Analytics for an iOS SwiftUI App
  • Run the app and put it into scenephase inactive or background

Firebase SDK Version

10.6.0

Xcode Version

14.2

Installation Method

Swift Package Manager

Firebase Product(s)

Analytics

Targeted Platforms

iOS

Relevant Log Output

2023-03-11 21:37:37.822985+0100 MyApp[10869:7635154] 10.6.0 - [FirebaseAnalytics][I-ACS023087] User property set. Name, value: lifetime_user_engagement (_lte), 92873658 2023-03-11 21:37:37.823493+0100 MyApp[10869:7635154] 10.6.0 - [FirebaseAnalytics][I-ACS023087] User property set. Name, value: session_user_engagement (_se), 5620 2023-03-11 21:37:37.823989+0100 MyApp[10869:7635154] 10.6.0 - [FirebaseAnalytics][I-ACS800014] Cannot get flag for unregistered flag. SDK name, flag name: app_measurement, session_stitching_token_feature_enabled 2023-03-11 21:37:37.824550+0100 MyApp[10869:7635154] 10.6.0 - [FirebaseAnalytics][I-ACS012018] Saving bundle. size (bytes): 546 2023-03-11 21:37:37.825096+0100 MyApp[10869:7635154] 10.6.0 - [FirebaseAnalytics][I-ACS023116] Bundle added to the upload queue. BundleID, timestamp (ms): 364, 1678567057698

If using Swift Package Manager, the project's Package.resolved

Expand Package.resolved snippet
{ "pins" : [ { "identity" : "abseil-cpp-swiftpm", "kind" : "remoteSourceControl", "location" : "https://github.com/firebase/abseil-cpp-SwiftPM.git", "state" : { "revision" : "583de9bd60f66b40e78d08599cc92036c2e7e4e1", "version" : "0.20220203.2" } }, { "identity" : "boringssl-swiftpm", "kind" : "remoteSourceControl", "location" : "https://github.com/firebase/boringssl-SwiftPM.git", "state" : { "revision" : "dd3eda2b05a3f459fc3073695ad1b28659066eab", "version" : "0.9.1" } }, { "identity" : "firebase-ios-sdk", "kind" : "remoteSourceControl", "location" : "https://github.com/firebase/firebase-ios-sdk.git", "state" : { "revision" : "60f9a33e7084482df67b48e16f315f4f7a6f5da9", "version" : "10.6.0" } }, { "identity" : "googleappmeasurement", "kind" : "remoteSourceControl", "location" : "https://github.com/google/GoogleAppMeasurement.git", "state" : { "revision" : "04351180d4c757c6c16127cb57b685fff9ef260b", "version" : "10.6.0" } }, { "identity" : "googledatatransport", "kind" : "remoteSourceControl", "location" : "https://github.com/google/GoogleDataTransport.git", "state" : { "revision" : "f6b558e3f801f2cac336b04f615ce111fa9ddaa0", "version" : "9.2.1" } }, { "identity" : "googleutilities", "kind" : "remoteSourceControl", "location" : "https://github.com/google/GoogleUtilities.git", "state" : { "revision" : "0543562f85620b5b7c510c6bcbef75b562a5127b", "version" : "7.11.0" } }, { "identity" : "grpc-ios", "kind" : "remoteSourceControl", "location" : "https://github.com/grpc/grpc-ios.git", "state" : { "revision" : "8440b914756e0d26d4f4d054a1c1581daedfc5b6", "version" : "1.44.3-grpc" } }, { "identity" : "gtm-session-fetcher", "kind" : "remoteSourceControl", "location" : "https://github.com/google/gtm-session-fetcher.git", "state" : { "revision" : "96d7cc73a71ce950723aa3c50ce4fb275ae180b8", "version" : "3.1.0" } }, { "identity" : "leveldb", "kind" : "remoteSourceControl", "location" : "https://github.com/firebase/leveldb.git", "state" : { "revision" : "0706abcc6b0bd9cedfbb015ba840e4a780b5159b", "version" : "1.22.2" } }, { "identity" : "nanopb", "kind" : "remoteSourceControl", "location" : "https://github.com/firebase/nanopb.git", "state" : { "revision" : "819d0a2173aff699fb8c364b6fb906f7cdb1a692", "version" : "2.30909.0" } }, { "identity" : "promises", "kind" : "remoteSourceControl", "location" : "https://github.com/google/promises.git", "state" : { "revision" : "ec957ccddbcc710ccc64c9dcbd4c7006fcf8b73a", "version" : "2.2.0" } }, { "identity" : "swift-protobuf", "kind" : "remoteSourceControl", "location" : "https://github.com/apple/swift-protobuf.git", "state" : { "revision" : "0af9125c4eae12a4973fb66574c53a54962a9e1e", "version" : "1.21.0" } } ], "version" : 2 } 

If using CocoaPods, the project's Podfile.lock

Expand Podfile.lock snippet
Replace this line with the contents of your Podfile.lock!

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