The number has always been different.
At the same time, we could look for anomalies in the number of requests that started to be executed, but for some reason did not end. To do this, we have determined how many requests in processing is the norm. More precisely, we have defined the lower and upper control border. Values that were located in the corridor between them, we considered the norm. According to the theory formed by Shewhart, crossing of these borders indicates the possible existence of a special reason (in our case, a certain anomaly associated with requests).