Put any of these in the enabledEvents array of your conf.json file to utilize the event whitelist. They should all be self-explanatory.
cardCreatedcardDescriptionChangedcardDueDateChangedcardPositionChangedcardListChangedcardNameChangedcardUnarchivedcardArchivedcardDeletedcommentEditedcommentAddedmemberAddedToCardmemberAddedToCardBySelfmemberRemovedFromCardmemberRemovedFromCardBySelflistCreatedlistNameChangedlistPositionChangedlistUnarchivedlistArchivedattachmentAddedToCardattachmentRemovedFromCardchecklistAddedToCardchecklistRemovedFromCardchecklistItemMarkedCompletechecklistItemMarkedIncomplete
These are other events that ostensibly exist, but have not yet been implemented in Trellobot, or aren't available from the Trello API, so you can't get alerts for them.
addAdminToBoardaddAdminToOrganizationaddBoardsPinnedToMemberaddLabelToCardaddMemberToBoardaddMemberToOrganizationaddToOrganizationBoardconvertToCardFromCheckItemcopyBoardcopyCardcopyChecklistcopyCommentCardcreateBoardcreateBoardInvitationcreateBoardPreferencecreateChecklistcreateLabelcreateOrganizationcreateOrganizationInvitationdeleteBoardInvitationdeleteCheckItemdeleteLabeldeleteOrganizationInvitationdisablePlugindisablePowerUpemailCardenablePluginenablePowerUpmakeAdminOfBoardmakeAdminOfOrganizationmakeNormalMemberOfBoardmakeNormalMemberOfOrganizationmakeObserverOfBoardmemberJoinedTrellomoveCardFromBoardmoveCardToBoardmoveListFromBoardmoveListToBoardremoveAdminFromBoardremoveAdminFromOrganizationremoveBoardsPinnedFromMemberremoveFromOrganizationBoardremoveLabelFromCardremoveMemberFromBoardremoveMemberFromOrganizationunconfirmedBoardInvitationunconfirmedOrganizationInvitationupdateBoardupdateCheckItemupdateChecklistupdateLabelupdateMemberupdateOrganizationvoteOnCard