Please refer to the Language Agent Backward Compatibility table for Splunk AppDynamics Agents and Splunk AppDynamics Controller Tenant compatibility.

As long as all agents are compatible with the Controller Tenant version, a monitored environment may have different agent versions deployed in it at a given time. However, the oldest agents should be on originating tiers of any business transactions. This ensures that agents on downstream nodes can process the correlation header created by the originating tier.

When rolling out agent upgrades, be sure to start upgrading the agents on the nodes of downstream tiers first, and then upgrade the agents on the originating tier nodes last.