Container App Environment OpenTelemetry endpoint is not sending the data to the Application Insights

Question

Container App Environment OpenTelemetry endpoint is not sending the data to the Application Insights

Alex Kuzko 0

We've setup the OTel Endpoints in the Container App Environment.
We are using the Application Insights as the destination for Traces and Logs. The connection string is good and the setup has been made using the az cli script:

az containerapp env telemetry app-insights set \

--resource-group RG \

--name CAE \

--connection-string "InstrumentationKey=KEY;IngestionEndpoint=https://centralus-2.in.applicationinsights.azure.com/;LiveEndpoint=https://centralus.livediagnostics.monitor.azure.com/;ApplicationId=ID" \

--enable-open-telemetry-traces true \

--enable-open-telemetry-logs true

As result it is properly set as Configured and our Container Apps got the additional environment variables:

declare -x CONTAINERAPP_OTEL_LOGGING_GRPC_ENDPOINT="http://k8se-otel.k8se-apps.svc.cluster.local:4317/v1/logs"

declare -x CONTAINERAPP_OTEL_METRIC_GRPC_ENDPOINT="http://k8se-otel.k8se-apps.svc.cluster.local:4317/v1/metrics"

declare -x CONTAINERAPP_OTEL_TRACING_GRPC_ENDPOINT="http://k8se-otel.k8se-apps.svc.cluster.local:4317/v1/traces"

declare -x OTEL_EXPORTER_OTLP_ENDPOINT="http://k8se-otel.k8se-apps.svc.cluster.local:4317"

declare -x OTEL_EXPORTER_OTLP_PROTOCOL="grpc"

declare -x OTEL_RESOURCE_ATTRIBUTES="service.instance.id=CONTAINER_APP_NAME_ID,service.namespace=CONTAINER_APP_ENV,service.version=CONTAINER_APP_NAME_ID"

declare -x OTEL_SERVICE_NAME="CONTAINER_APP_NAME"

It is clear that the settings are OK.

Now we are trying to send data to these endpoints using opentelemetry SDK in Python and while it is connecting properly the data is not in Application Insights.

We are searching in table named "traces". There are just nothing from the Container App we have...

What should we do to check our setup and is is possible that we need to adjust the Application Insights itself to support incoming logs & traces from the Container App Environment OTel Endpoint?

SUNOJ KUMAR YELURU 18,736 Reputation points MVP Volunteer Moderator

2025-10-03T08:29:18.2866667+00:00
Hello @Alex Kuzko

To resolve the issue of OpenTelemetry data not appearing in Application Insights from a Container App Environment, the primary focus should be on verifying the Python application's OpenTelemetry SDK configuration, ensuring it correctly uses the provided environment variables for OTLP gRPC export. Concurrently, network connectivity from the container app to the internal OTel collector endpoint (k8se-otel.k8se-apps.svc.cluster.local:4317) must be confirmed. Finally, a thorough check of Application Insights' ingestion status and the connection string details is crucial to rule out issues at the destination. A minimal test application can help isolate whether the problem lies with the application's OTel setup or the broader CAE/Application Insights integration.

Alternative Viewpoints

Application Insights Misconfiguration: While the connection string is stated as "good," a subtle error (e.g., incorrect region for the ingestion endpoint, or a typo) could prevent Application Insights from receiving data, even if the OTel collector successfully forwards it.

Internal OTel Collector Issue: The managed OTel collector within the Container App Environment might be experiencing an internal issue, preventing it from processing incoming OTLP data or forwarding it to Application Insights, even if the container app successfully sends data to it.

If the Answer is helpful, please click Accept Answer and Up-Vote, so that it can help others in the community looking for help on similar topics.
Alex Kuzko 0 Reputation points

2025-10-03T08:44:47.1266667+00:00

We have verified all the network connectivity and etc. The OTel Endpoint is alive and accepting connections.

However after messages/traces sent we see nothing in App Insights, no errors from the exporter, nothing.

So basically the question is not how to debug the Python, but how to VERIFY that OTel Endpoint is working and sending traces to the Application Insights?

Do we have any test Docker image/etc. which could be used to test and prove the setup validity?
Rakesh Mishra 11,350 Reputation points Microsoft External Staff Moderator

2025-10-08T06:37:17.29+00:00

Hi Alex Kuzko,

Welcome to the Microsoft Q&A Platform! Thank you for asking your question here.

I have reached out to you over Private message. Could you please check and share the requested information to assist you further on this.

How to access the private message in Microsoft Q&A : https://learn.microsoft.com/en-us/answers/support/private-messages
Rakesh Mishra 11,350 Reputation points Microsoft External Staff Moderator

2025-10-09T03:26:50.1866667+00:00

@Alex Kuzko , following up to see if you had a chance to check my previous response. Please share the requested information if you're still facing the issue and need any further assistance on this.
Anurag Rohikar 3,190 Reputation points Microsoft External Staff Moderator

2025-10-14T17:17:37.2933333+00:00
Hi Alex Kuzko,

Thanks for confirming the connectivity and exporter behavior. Since your focus is on verifying that the Container App Environment’s managed OpenTelemetry collector is successfully forwarding data to Application Insights, could you please check a few things for us:

Are your Container App Environment and Application Insights in the same Azure region? (Cross-region ingestion is not currently supported.)

Can you confirm whether metrics or logs appear in Application Insights, or only traces are missing?

Could you check if there are any health probe failures for the internal OTel collector?

kubectl get pods -n kube-system | grep otel # or via Azure Portal -> Container App Environment -> Observability -> Logs

Can you share the output of:

az containerapp env telemetry show --name <env-name> --resource-group <rg-name>

(This will confirm the backend endpoint bindings and telemetry state.)

also, could you please provide with requested information asked by Rakesh in personal message?
Anurag Rohikar 3,190 Reputation points Microsoft External Staff Moderator

2025-10-15T09:36:46.0066667+00:00

Hi Alex Kuzko, following up to see if you had a chance to check my previous response. Please share the requested information if you're still facing the issue and need any further assistance on this.
Anurag Rohikar 3,190 Reputation points Microsoft External Staff Moderator

2025-10-16T10:14:14.7966667+00:00

Hi Alex, Just checking to see if you have a chance to check my previous response and helped, do let me know if you have any further questions on this. Thank you!

Your answer

SUNOJ KUMAR YELURU 18,736 Reputation points MVP Volunteer Moderator

2025-10-03T08:29:18.2866667+00:00

Hello @Alex Kuzko

To resolve the issue of OpenTelemetry data not appearing in Application Insights from a Container App Environment, the primary focus should be on verifying the Python application's OpenTelemetry SDK configuration, ensuring it correctly uses the provided environment variables for OTLP gRPC export. Concurrently, network connectivity from the container app to the internal OTel collector endpoint (k8se-otel.k8se-apps.svc.cluster.local:4317) must be confirmed. Finally, a thorough check of Application Insights' ingestion status and the connection string details is crucial to rule out issues at the destination. A minimal test application can help isolate whether the problem lies with the application's OTel setup or the broader CAE/Application Insights integration.

Alternative Viewpoints

Application Insights Misconfiguration: While the connection string is stated as "good," a subtle error (e.g., incorrect region for the ingestion endpoint, or a typo) could prevent Application Insights from receiving data, even if the OTel collector successfully forwards it.

Internal OTel Collector Issue: The managed OTel collector within the Container App Environment might be experiencing an internal issue, preventing it from processing incoming OTLP data or forwarding it to Application Insights, even if the container app successfully sends data to it.

If the Answer is helpful, please click Accept Answer and Up-Vote, so that it can help others in the community looking for help on similar topics.
Alex Kuzko 0 Reputation points

2025-10-03T08:44:47.1266667+00:00

We have verified all the network connectivity and etc. The OTel Endpoint is alive and accepting connections.

However after messages/traces sent we see nothing in App Insights, no errors from the exporter, nothing.

So basically the question is not how to debug the Python, but how to VERIFY that OTel Endpoint is working and sending traces to the Application Insights?

Do we have any test Docker image/etc. which could be used to test and prove the setup validity?
Rakesh Mishra 11,350 Reputation points Microsoft External Staff Moderator

2025-10-08T06:37:17.29+00:00

Hi Alex Kuzko,

Welcome to the Microsoft Q&A Platform! Thank you for asking your question here.

I have reached out to you over Private message. Could you please check and share the requested information to assist you further on this.

How to access the private message in Microsoft Q&A : https://learn.microsoft.com/en-us/answers/support/private-messages
Rakesh Mishra 11,350 Reputation points Microsoft External Staff Moderator

2025-10-09T03:26:50.1866667+00:00

@Alex Kuzko , following up to see if you had a chance to check my previous response. Please share the requested information if you're still facing the issue and need any further assistance on this.
Anurag Rohikar 3,190 Reputation points Microsoft External Staff Moderator

2025-10-14T17:17:37.2933333+00:00

Hi Alex Kuzko,

Thanks for confirming the connectivity and exporter behavior. Since your focus is on verifying that the Container App Environment’s managed OpenTelemetry collector is successfully forwarding data to Application Insights, could you please check a few things for us:

Are your Container App Environment and Application Insights in the same Azure region? (Cross-region ingestion is not currently supported.)

Can you confirm whether metrics or logs appear in Application Insights, or only traces are missing?

Could you check if there are any health probe failures for the internal OTel collector?

kubectl get pods -n kube-system | grep otel # or via Azure Portal -> Container App Environment -> Observability -> Logs

Can you share the output of:

az containerapp env telemetry show --name <env-name> --resource-group <rg-name>

(This will confirm the backend endpoint bindings and telemetry state.)

also, could you please provide with requested information asked by Rakesh in personal message?
Anurag Rohikar 3,190 Reputation points Microsoft External Staff Moderator

2025-10-15T09:36:46.0066667+00:00

Hi Alex Kuzko, following up to see if you had a chance to check my previous response. Please share the requested information if you're still facing the issue and need any further assistance on this.
Anurag Rohikar 3,190 Reputation points Microsoft External Staff Moderator

2025-10-16T10:14:14.7966667+00:00

Hi Alex, Just checking to see if you have a chance to check my previous response and helped, do let me know if you have any further questions on this. Thank you!