It sort of depends on your situation. How many deployment clients do you anticipate having? Are there network segregation concerns? A properly provisioned Deployment Server can handle thousands of clients, so while there are some cases that a tiered deployment makes sense, it's usually not necessary.
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I have version 8.0.2 installed and get the same error on my Search Head:
Unable to initialize modular input "splunk_ta_aws_sqs" defined in the app "Splunk_TA_aws": Introspecting scheme=splunk_ta_aws_sqs: script running failed (exited with code 1)
For some reasons I don't get this error on my Heavy Forwarder (8.0.2 as well)
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