How do I provide HTTP client certificates in SDC 2.6+?

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I'm testing a production upgrade from SDC 2.4 to 2.6.

In 2.4, the HTTP client processor accepted the paths to both a trust store and a key store. While evaluating 2.6, I've noticed that the option to provide a key store is no longer present.

How can I supply client certificates in SDC 2.6+ when connecting to an HTTPS service that requires client certificate authentication?

Alibi: was this change announced somewhere? While I understand HTTPS client certificates are not ubiquitous like OAuth, this is a breaking change for anyone who requires the feature.