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# Factorio Runtime Docs Version 2.0.77

# Alert - Runtime Docs

## Alert :: table

#### Table fields

tick | :: MapTick | The tick this alert was created.
The tick this alert was created.
target | :: LuaEntity? |
prototype | :: LuaEntityPrototype? |
position | :: MapPosition? |
icon | :: SignalID? | The SignalID used for a custom alert. Only present for custom alerts.
The SignalID used for a custom alert. Only present for custom alerts.
message | :: LocalisedString? | The message for a custom alert. Only present for custom alerts.
The message for a custom alert. Only present for custom alerts.

Concept used in

- LuaPlayer::get_alerts()