title: how to detect trend e using flink CEP
body: <p>I am new to Flink CEP. For one of our use cases, we need to implement stream analytics for temperature sensor output. if the temperature keeps on increasing for 30 minutes, need to generate an alert to the operator. I went through the Pattern API but not able to find a way to model this in Pattern? Please suggest a possible way to detect this pattern using Pattern</p>