I've got several search head clusters. Can I use a single deployer to service all of them?
Only if you plan to provision them all in exactly the same way.
The deployer sends the same configuration bundle to all cluster members that it services. Therefore, if you have multiple search head clusters, you can use the same deployer for all the clusters only if the clusters employ exactly the same configurations, apps, and so on. If you anticipate that your clusters might need different configurations over time, set up a separate deployer for each cluster.
Only if you plan to provision them all in exactly the same way.
The deployer sends the same configuration bundle to all cluster members that it services. Therefore, if you have multiple search head clusters, you can use the same deployer for all the clusters only if the clusters employ exactly the same configurations, apps, and so on. If you anticipate that your clusters might need different configurations over time, set up a separate deployer for each cluster.