I am trying to understand the overlap between two of those roles in Azure RBAC. Looks like monitor-contributor completely covers application-insights-component-contributor besides "Microsoft.Resources/deployments/*". Considering the following situation whether I am deploying web availability tests into AppInsights resource and the deployment identity is service principal which was already granted monitor-contributor permissions. Should I grant this identity also 'application-insights-component-contributor' to be able to create those resources or 'monitor contributor' is good enough?
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I am also deploying alert rules along with the tests and those rules implemented as rm template, if SP was granted monitoring-contributor only it's fails with
Error: requesting Validation for Template Deployment "app508-dfpg-dev3-diag-eastus2-backoffice-ai-test-dep" (Resource Group "app508-dfpg-ne-diag-eastus2"): resources.DeploymentsClient#Validate: Failure sending request: StatusCode=403 -- Original Error: Code="AuthorizationFailed" Message="The client '2c20abbf-e825-495c-9d06-90c5f04f9c60' with object id '2c20abbf-0000-0000-0000-90c5f04f9c60' does not have authorization to perform action 'Microsoft.Resources/deployments/validate/action' over scope '/subscriptions/s/resourcegroups/app508-dfpg-ne-diag-eastus2/providers/Microsoft.Resources/deployments/app508-dfpg-dev3-diag-eastus2-backoffice-ai-test-dep' or the scope is invalid. If access was recently granted, please refresh your credentials."
No need to give the Application Insights Component Contributor role, Monitoring Contributor role is enough. When you deploying the web availability tests, you just need the Microsoft.Insights/webtests/* action permission, it is already included in Monitoring Contributor.