Instrumenting the “big three” managed Kubernetes offerings with Python

### Executive summary: This technical guide covers secure approaches for accessing the Kubernetes API on Google Kubernetes Engine (GKE), Azure Kubernetes Service (AKS), and Amazon Elastic Kubernetes Service (EKS) using cloud IAM credentials rather than in-cluster service account tokens; it explains design choices, prerequisites, provider-specific authentication flows (GCP OAuth tokens, Azure AD/Azure RBAC recommendations, and AWS STS-based EKS tokens), and includes Python recipes and caveats for each platform.