Which feature is NOT key to Google Cloud’s IAM service?

The feature that is not key to Google Cloud's Identity and Access Management (IAM) service is identity management for agents. IAM in Google Cloud focuses on providing fine-grained access control, allowing organizations to manage who (identity) can do what (roles) on which resources. This is essential for ensuring that users have the appropriate permissions based on their roles within the organization.

Auditing is a crucial feature of IAM as well, enabling tracking and logging of changes and access to resources, which is vital for compliance and security purposes. Additionally, identity management for service accounts is an important aspect of IAM, supporting secure interactions between applications and services in Google Cloud.

Identity management for agents is not a core feature of IAM, and the concept of "agents" typically refers to mechanisms that facilitate the management of resources rather than identities. While agents may play a role in monitoring or automating tasks, they do not represent a central feature of IAM. Thus, this answer is consistent with the primary functions and objectives of Google Cloud's IAM service.