# Watcher logic help

**URL:** <https://discuss.elastic.co/t/watcher-logic-help/265385>\
**Category:** Elasticsearch\
**Tags:** elastic-stack-alerting\
**Created:** [February 24, 2021, 5:40pm UTC](https://discuss.elastic.co/t/watcher-logic-help/265385 "2021-02-24T17:40:52Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![amStuckplsHelp](https://avatars.discourse-cdn.com/v4/letter/a/67e7ee/32.png) [@amStuckplsHelp](https://discuss.elastic.co/u/amStuckplsHelp)\
**Post date:** [February 24, 2021, 5:40pm UTC](https://discuss.elastic.co/t/watcher-logic-help/265385/1 "2021-02-24T17:40:52Z")

</div>

Hi,

I have a few servers which supply the number of 'current active users' on those servers to my Elastic stack via Logstash.  
I am trying to create a watch such that;  
If the number of 'current active users' drops by 70% over a 5 minute period, then send an email alert.  
So the basic logic looks like:  
If currentActiveUsers(@time=now) \< (0.3 \* currentActiveUsers(@time=(now-5mins))), then send email alert.

Is this even possible?  
The relevant parts of the Watch JSON looks like this but it definitely doesn't compile as is:

```auto
  "input": {
    "search": {
      "request": {
        "body": {
          "size": 0,
          "query": {
            "bool": {
              "filter": {
                "range": {
                  "@timestamp": {
                    "gte": "{{ctx.trigger.scheduled_time}}||-5m",
                    "lte": "{{ctx.trigger.scheduled_time}}",
                    "format": "strict_date_optional_time||epoch_millis"
                  }
                }
              }
            }
          },
          "aggs": {
            "bucketAgg": {
              "terms": {
                "field": "hostname.keyword",
                "size": "10",
                "order": {
                  "metricAgg": "desc"
                }
              },
              "aggs": {
                "metricAgg": {
                  "max": {
                    "field": "CurrentActiveSessions"
                  }
                }
              }
            }
          }
        },
        "indices": [
          "<useful_index>"
        ]
      }
    }
  }
"condition": {
    "script": {
      "source": "ArrayList arr = ctx.payload.aggregations.bucketAgg.buckets; for (int i = 0; i < arr.length; i++) { if (arr[i]['metricAgg'].value{{ctx.trigger.scheduled_time}} < params.threshold * arr[i]['metricAgg'].value{{ctx.trigger.scheduled_time}}||-5m) { return true; } } return false;",
      "params": {
        "threshold": 0.3
      }
    }
  }
 "actions": {
    "email_1": {
      "email": {
        "profile": "standard",
        "to": [
          "amStuck@sendHelpPls.com"
        ],
        "subject": "Active Sessions Alert!",
        "body": {
          "text": "Active Sessions Alert!\nThe number of active sessions connected to {{ctx.payload.hostname.keyword}} has dropped 70% in the last 5 minutes."
        }
      }
    }
  }

```

The syntax in the condition statement is very wrong but I am not sure how to fix it  
Any help is most appreciated,  
Thank You!

---

<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [March 24, 2021, 5:41pm UTC](https://discuss.elastic.co/t/watcher-logic-help/265385/2 "2021-03-24T17:41:41Z")

</div>

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