Site24x7

            Site24x7's intelligent polling logic during Monitor outage

            For Internet service monitors, all paid plans, excluding the Enterprise plans allows you to monitor your websites from 8 test locations (1 primary and 7 secondary locations). For Enterprise plans, monitoring can be performed from up to 16 locations. On purchasing a custom plan, you get to monitor from all Site24x7 test locations. 

            Site24x7 uses a predictable polling from a location logic to ensure a uniform and intelligible graph. On the contrary, other vendors use a round-robin methodology, which gives too many spikes between polls because of latency differences due to different geographical conditions. You can pick different sets of test locations for different monitors from our list of 90+ geographical locations. Site24x7 allows monitoring from the primary location at a poll frequency, as low as one minute. Monitoring from secondary locations is performed every 30 minutes, by default. However, if you need secondary polling at a much lower frequency than this, you must contact our sales team.

            Site24x7's location recheck logic during outage

            Our recheck logic is primarily based on the downtime rules set in your threshold profiles. In general, the primary location polls based on the check frequency set by you (can be as low as one minute); and the secondary locations poll, every 30 minutes (called Hourly Poll - Polling from all secondary Locations twice an hour), by default. In case the primary is DOWN, there will be immediate rechecks from 3 (by default) locations/based on the preset downtime rules in threshold configuration. This is a random selection of a location that we do from among the locations that are mapped in your location profile.

            The rechecks from the secondary location will be done as per the set logic. Let's say monitor A has 1 primary and 7 secondary locations. Downtime rules configured are 3. If the primary is DOWN, there will be an immediate recheck from the two secondary locations; if all the three locations, including the primary location, are DOWN, we will trigger an email alert. However, polling from the remaining 5 locations will continue.

            In case the recheck is set at 1, then we will alert immediately after the primary fails.

            Location Rechecks will be automatically removed if the monitors are in DOWN status for more than 3 Hours. Hourly Poll will also be revoked if the monitors are in DOWN status for more than 10 days.

            Uptime Steroids for Advanced Monitors (Web Transaction Monitor)

            Uptime steroids are an added status check for advanced monitors like Web Transaction Monitor. This is to facilitate aggressive uptime monitoring, where status checks will be performed for the first URL in the sequence every 1 min. If it identifies any change in status, it will trigger the monitor's actual data collection irrespective of the set polling frequency and identify the monitor's actual status. The actual monitor status data will be captured in the Monitor's Log Report. However, you'll not be able to view any performance metrics for these checks. Hence, the same will be highlighted as a (-) in the Log Report.

            Aggressive checks

            When a monitor's status changes from UP to DOWN, aggressive rechecks will be performed at a certain frequency until the next poll, irrespective of the set polling interval. It will go into regular polling mode thereafter. However, an alert will be triggered when there is a change in the status of the monitor from DOWN to UP.
            Updated: 06 Feb 2018 04:28 AM
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