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---
upgrade:
- Ironic no longer supports agent lookup/heartbeats as vendor passthru
methods. All out-of-tree drivers must be updated to use
``AgentDeployMixin`` classes directly without relying on
``BaseAgentVendor`` class and other classes that were inheriting from it
(e.g. ``agent.AgentVendorInterface`` and ``iscsi_deploy.VendorPassthru``).
This means that ironic is incompatible with deploy ramdisks based on Ironic
Python Agent (IPA) < 1.5.0. Operators must update their IPA-based deploy
ramdisks in this case. Operators using non-IPA based deploy ramdisks which
use ironic lookup/heartbeats functionality must update their ramdisks to
use the top level ironic lookup/heartbeats REST API, available since ironic
API v1.22.
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