How does the Poll Strategy setting work for website monitors?
When configuring thresholds for performance metrics, you can set strategies that the website monitor will use to send alerts during a threshold breach. There are twelve options available:
- Poll count
- Poll average
- Time duration
- Average time
- Poll sum
- Time sum
- Min poll
- Min time
- Max poll
- Max time
- 95th percentile poll
- 95th percentile time
The default strategy option is Poll count.
Poll Count:
Poll count refers to the number of times Site24x7 checks the status of a resource (such as CPU usage) within a predefined period (like five minutes). If a threshold value is breached during five consecutive poll counts, a Trouble alert is sent to the users. For instance, let the threshold value of CPU usage be 70%.
By the end of the eighth poll, a Trouble alert is sent to the user.
Poll average:
During five consecutive polls, if the average CPU usage exceeds the threshold value, a Trouble alert is sent to the users.
Sum of CPU usage for the first five consecutive polls: 68+74+71+75+70 = 358
Average: (358)/5 =71.6
Since the average exceeds 70, a Trouble alert is sent to the users.
Time duration:
When CPU usage exceeds 70% within a time span of five minutes, a Trouble alert is sent.
After the poll at 12:56am, a Trouble alert is sent to the user.
Average time:
When CPU usage exceeds an average of 70% within a time span of five minutes, a Trouble alert is sent.
Sum of CPU usage for the first five minutes: 68+74+71+75+70 = 358
Average: (358)/5 =71.6
Since the average exceeds 70, a Trouble alert is sent to the users.
Poll sum
During five consecutive polls, if the sum of failed requests exceeds a predefined value, such as 10, a Trouble alert is sent to the users.
By the end of seventh poll, the sum of failed requests for five consecutive polls is 3+2+3+1+2 = 11. So, a Trouble alert is sent.
Time sum
When the number of failed requests exceeds 10 within a predefined time span, like five minutes, Trouble alert is sent to the users.
By 12:55am, the sum of failed requests within five minutes is 3+2+3+1+2 = 11. So, a Trouble alert is sent.
Min poll
If the lowest page view count recorded during 10 continuous polls is below the threshold, such as five, then a Trouble alert is sent to the users.
Of these recorded values (12, 15, 10, 7, 17, 20, 3, 8), the lowest is three, which is less than five. So, a Trouble alert is sent.
Min time
If the lowest page view recorded during any polling interval within a 10-minute timeframe is less than a predefined threshold, like 5, a Trouble alert is sent to users.
Of these recorded values (7, 10, 6, 2, 8, 8, 6, 9, 10, 7), two is the lowest, which is less than five. So, a Trouble alert is sent to users.
Max poll
If the lowest page view count recorded during 10 continuous polls is above the threshold, such as 100, then a Trouble alert is sent to the users.
Of these recorded values (94, 75, 60, 73, 67, 105, 93, 88), the highest is 105. This value is greater than 100. So, a Trouble alert is sent to the users.
Max time
If the page view count recorded during any polling interval within a 10-minute timeframe is more than a predefined threshold, like 100, a Trouble alert is sent to users.
Of these recorded values (79, 80, 65, 92, 89, 98, 76, 94, 109), the highest is 109. This is greater than 100. So, a Trouble alert is sent to the users.
95th percentile poll
For a predefined set of continuous polls, like five, if the predefined 95th percentile value, say 10, is reached, then a Trouble alert is sent.
The 95th percentile for the third poll is 10. So, a Trouble alert is sent to the users.
95th percentile time
For a predefined set of time, like 10 minutes, if the predefined 95th percentile value, say 10, is reached, then a Trouble alert is sent.
The 95th percentile in the sixth minute is 10. So, a Trouble alert is sent to the user.
To make sure the condition applied on the strategy “Strategy-3: Time duration or Strategy-4: Average value during time duration” for threshold breach detection works as intended, you must ensure that you specify a time duration which is at least twice the applied check frequency for that monitor.
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