Getting rid of the internal SPI warning message

I’ve created a custom event listener, when starting it I get this warning:

10:11:47,230 WARN  [] (MSC service thread 1-4) KC-SERVICES0047: login-timestamp-attributes ( is implementing the internal SPI eventsListener. This SPI is internal and may change without notice

which interface should I implement to avoid this warning?

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I don’t think this is a problem. Most of the SPIs exposed for building extensions to Keycloak are technically “internal”, but have been that way from the beginning, and haven’t changed.