Domain Controller computer logons?

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I'm currently dealing with an environment with a number of domain controllers that will need to begin forwarding Windows event logs into Splunk. A worry is license threshold.

I've whitelisted only the event codes we are interested in, but this has done little as 4624/4634, account logons/logoffs, have a lot of noise with network logons. I've toyed with blacklisting any logon using a computer's sAMAccountName$. This drops off our license usage per DC immensely, but I'm worried that we might be missing some valuable event data.

Does anyone have any insight to if this is a good/bad practice, what types of info we'd be missing out on, and/or any alternative suggestions to minimizing the load that DC's place on license usage?

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