Does Azure Function log-level in host.json overwrite appsettings-file loglevel and Application insight loglevel?

Question

log level can be configured in host.json file:

In my app in addition to host.json i have appsettings for dev/test/prod. The appsettingsfiles does not specify anything about loglevel, and nothing about application insight loglevel.

Does host.json impose its configured log-level to all environments, including application insight loggin?

Yes, `host.json` is used for logging data in application insights for azure functions — RithwikBojja, Jan 05 '23 at 09:40

score 1 · Accepted Answer · answered Jan 05 '23 at 11:33

Does host.json impose its configured log-level to all environments, including application insight loggin?

Yes, host.json configures application insights and logs function app logs to application insights.
In Host.json we will set the logging configurations which are used after deploying the function app.

Example:

    "logging": {
        "applicationInsights": {
          "samplingSettings": {
            "isEnabled": true,
            "excludedTypes": "Request"     
          }
        }
        }

enter image description here

local.settings.json contains AzureWebJobsStorage, FUNCTIONS_WORKER_RUNTIME,APPINSIGHTS_INSTRUMENTATIONKEY

Example:

{
    "IsEncrypted": false,
  "Values": {
    "AzureWebJobsStorage": "UseDevelopmentStorage=true",
    "FUNCTIONS_WORKER_RUNTIME": "dotnet",
    "APPINSIGHTS_INSTRUMENTATIONKEY": "27ef877b-5298-4cd9-8a45-a6b99bcc395d"
  }
}

enter image description here

References taken from:

Does Azure Function log-level in host.json overwrite appsettings-file loglevel and Application insight loglevel?

1 Answers1