alert()

Raises an alert from inside your own logic, with a message you build. It is the one output-shaped function with no top-level rule, so it may be called inside a branch — which is what makes "alert me when this happens" expressible. It fires at most once per bar, only on realtime bars, and only when the script is running as an alert; on historical bars it does nothing.

                alert(series string message) → void
              

          indicator("RSI Alert", overlay=false)

rsi = talib.rsi(close, 14)

if talib.crossover(rsi, 70) {
    alert("RSI crossed above 70!")
}