I see a role in Application Insights called: unknown_service:Microsoft.Azure.WebJobs.Script.WebHost

Question

I see a role in Application Insights called: unknown_service:Microsoft.Azure.WebJobs.Script.WebHost

Domenic Helfenstein 26

Hi

As I wrote in the title I see something called "unknown_service:Microsoft.Azure.WebJobs.Script.WebHost" is connected to my application insights. I have already two services (1 regular app service and 1 azure function service) wired up to this app insights instance. At first glance, it looks like unknown_service:Microsoft.Azure.WebJobs.Script.WebHost stems the functions service, but I'm not sure about that.

What can I do about it?

Lakshma Reddy Vattijonnala 1,660 Reputation points Microsoft External Staff Moderator

2026-06-22T12:12:25.5933333+00:00

Hi @Domenic Helfenstein Thank you for reaching out to Microsoft Q&A. We are looking into the issue and we will get back to you shortly with an update
Golla Venkata Pavani 7,535 Reputation points Microsoft External Staff Moderator

2026-06-22T17:13:54.19+00:00
Hi @Domenic Helfenstein

Thank you for reaching us regarding the issue.

Please provide answers for below questions to investigate the issue further.

Which Azure resources are currently sending telemetry to this Application Insights instance?

Does the unknown_service:Microsoft.Azure.WebJobs.Script.WebHost role appear only when the Azure Function App is running?

In the Application Insights Logs, do the events associated with this role show distinct values for cloud_RoleName, cloud_RoleInstance, and sdkVersion that map to a specific Function App?

Are both the App Service and the Function App configured to send telemetry to this same Application Insights resource?
Please share screenshots (or details) of the Application Insights settings for both resources.
Golla Venkata Pavani 7,535 Reputation points Microsoft External Staff Moderator

2026-06-23T18:30:02.8233333+00:00

Hi @Domenic Helfenstein

Please provide answers for above questions to investigate the issue further.

Thanks for the update and for trying the WEBSITE_CLOUD_ROLENAME setting on your Function App.

The unknown_service:Microsoft.Azure.WebJobs.Script.WebHost role is coming from the WebJobs Script Host, which powers both Azure Functions and WebJobs running inside App Service. Since your Web App (timerocket-backend) has a continuous WebJob (visible in the DaaS entry), the telemetry is likely originating from there.

Recommended next step:

Please add the same application setting on your Azure Web App as well:

Go to your App Service > Configuration > Application settings

Add: Name: WEBSITE_CLOUD_ROLENAME Value: timerocket-backend (or any friendly name you prefer)

Save and restart the App Service.

Reference: https://learn.microsoft.com/en-us/azure/azure-functions/functions-app-settings https://learn.microsoft.com/en-us/azure/azure-monitor/app/app-map#set-cloud-role-names

Kindly let us know if the above helps or you need further assistance on this issue.

Please "upvote" if the information helped you. This will help us and others in the community as well.

Answer accepted by question author

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Your answer

Lakshma Reddy Vattijonnala 1,660 Reputation points Microsoft External Staff Moderator

2026-06-22T12:12:25.5933333+00:00

Hi @Domenic Helfenstein Thank you for reaching out to Microsoft Q&A. We are looking into the issue and we will get back to you shortly with an update
Golla Venkata Pavani 7,535 Reputation points Microsoft External Staff Moderator

2026-06-22T17:13:54.19+00:00

Hi @Domenic Helfenstein

Thank you for reaching us regarding the issue.

Please provide answers for below questions to investigate the issue further.

Which Azure resources are currently sending telemetry to this Application Insights instance?

Does the unknown_service:Microsoft.Azure.WebJobs.Script.WebHost role appear only when the Azure Function App is running?

In the Application Insights Logs, do the events associated with this role show distinct values for cloud_RoleName, cloud_RoleInstance, and sdkVersion that map to a specific Function App?

Are both the App Service and the Function App configured to send telemetry to this same Application Insights resource?
Please share screenshots (or details) of the Application Insights settings for both resources.
Golla Venkata Pavani 7,535 Reputation points Microsoft External Staff Moderator

2026-06-23T18:30:02.8233333+00:00

Hi @Domenic Helfenstein

Please provide answers for above questions to investigate the issue further.

Thanks for the update and for trying the WEBSITE_CLOUD_ROLENAME setting on your Function App.

The unknown_service:Microsoft.Azure.WebJobs.Script.WebHost role is coming from the WebJobs Script Host, which powers both Azure Functions and WebJobs running inside App Service. Since your Web App (timerocket-backend) has a continuous WebJob (visible in the DaaS entry), the telemetry is likely originating from there.

Recommended next step:

Please add the same application setting on your Azure Web App as well:

Go to your App Service > Configuration > Application settings

Add: Name: WEBSITE_CLOUD_ROLENAME Value: timerocket-backend (or any friendly name you prefer)

Save and restart the App Service.

Reference: https://learn.microsoft.com/en-us/azure/azure-functions/functions-app-settings https://learn.microsoft.com/en-us/azure/azure-monitor/app/app-map#set-cloud-role-names

Kindly let us know if the above helps or you need further assistance on this issue.

Please "upvote" if the information helped you. This will help us and others in the community as well.

Answer 1

Christos Panagiotidis 3,551

This is not a third Azure resource or an error. unknown_service:Microsoft.Azure.WebJobs.Script.WebHost is OpenTelemetry’s fallback service name for the WebJobs Script Host, the process used by Azure Functions and WebJobs. Since your App Service contains a continuous WebJob and both apps send to the same Application Insights resource, that WebJob is the likely source.

Set a stable role name on the resource that emits it. For OpenTelemetry, add OTEL_SERVICE_NAME=timerocket-backend-webjob to the Web App’s application settings, use a different value on the Function App, then restart both apps. Application Insights uses service.name as the Cloud Role Name.

You can confirm the producer first by filtering Logs for that cloud_RoleName and comparing cloud_RoleInstance and sdkVersion while stopping and starting the WebJob. Existing telemetry keeps the old label; only new data uses the new name.

Domenic Helfenstein 26 Reputation points

2026-07-16T12:30:39.7333333+00:00

Finally someone, who knows what they're talking about. Yes, OTEL_SERVICE_NAME was the env var to set (on our Azure Function). WEBSITE_CLOUD_ROLENAME did nothing.