Calculation of nagios latency in nagiostas

[Yu Watanabe]

Hello all.

I would like to ask question for the calculation with nagios latecy.
In the nagiostats.c , the calculation of 'average_active_service_latency' is
not doing the simple way, which is 

1. Add up the latecy of each service
2. Devide by the number of services

rather than above it is caculating as,

average_active_service_latency=(((average_active_service_latency*((double)active_service_checks-1.0))+latency)/(double)active_service_checks);

1. Revert the average sum by multiplying the previous average and number of checks
2. Add up the latency of the current line
3. Devide by the number of services

Would there be a specific reason or thought in this calculation?

Thanks,
Yu Watanabe


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