Knowledge Base

What is shown in the "Coverage" column in data tables of PRTG Traffic Grapher?

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In data table of PRTG Traffic Grapher there is a special column "coverage": This value tells you if the monitoring was actually working all the time and whether it has covered the complete time period.

E.g. if PRTG is shut down for 15 minutes of an hour you will see a value of 75% of coverage for this hour (for the remaining 45 minutes) that were actually covered by monitoring.

If you need reliable and complete data from your monitoring this value should always be 100% or close to 100%.

If the coverage is below 100% but PRTG was running all the time then there may be a technical problem with the sensor. PRTG was not able to get all the data it needs to completely calculate the traffic over time. Most common reasons are network problems (e.g. packet loss, connectivity issues) and device problems (e.g. some devices limit the number of SNMP request per minute, so if they are scanned too frequently a number of requests remain unanswered).

For SNMP sensors sometime the High Compatibility settings (see the Tweaks page of the Extras|Options dialog) can be helpful in this situation.

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PRTG Traffic Grapher V6