Special thanks to Flechen for discovering the turret side of this issue, but Death Notes is not reporting messages when a turret (auto or flame) or a trap kills an NPC of any sort, even if the config file specifies it. This will be corrected in 6.4.4. Please be sure to add the respective additions to your config file for these if you wish to report them. For example:
{
"KillerType": "Turret",
"VictimType": "*",
"DamageType": "*",
"Messages": [
"{owner}'s {killer} did its job, killing a {victim}."
]
},
{
"KillerType": "Trap",
"VictimType": "*",
"DamageType": "*",
"Messages": [
"{victim} fell victim to {owner}'s well placed {killer}."
]
},