Detection is cheap. Attention is expensive.
Modern systems can detect hundreds of market events. Sending all of them to the trader creates a new problem: the trader must now filter the alert system instead of the market.
The useful threshold is not whether an event can be detected. It is whether the event changes something the trader actually cares about.
Preserve the why
An alert should include the market state that made the event relevant. A level touch in a strong trend is not the same thing as the same touch inside a range.
Context makes the alert actionable because the trader can understand what changed without rebuilding the entire market picture from scratch.
Let the alert start a workflow
The best alert is interactive: open the chart, explain the evidence, mute similar events, disable the alert or continue into a trade plan. That turns a notification into a decision surface.