Plivo’s message delivery monitoring systems evaluate the delivery rate of the outbound messages every 15 mins. This data is then compared with the delivery rates for the same time period over the last 7 days. If a 25% or more drop in delivery in observed from the data, an email alert is sent to the configured email address. 

For example: 

  1. At 13:00 Jan 10 2019, our systems calculate the delivery rate of the messages processed between 12:00 Jan 10 2019 to 13:00 Jan 10 2019. Let's assume the delivery rate calculated here is 70%. 
  2. This is then compared with average delivery rates over the last 7 days (Jan 4 to Jan 10 ) for the time period 12:00 to 13:00 each day. Say the average delivery rate from these data points is 95%.
  3. The drop in delivery rate here is 26.3% which is more than 25%. This will trigger a delivery degradation email alert to the configured email address.

Note: For outbound messages, an evaluation period is only considered valid if at least 250 outbound messages were processed during that 1 hour. For cases where number of messages are less than 250 no email alerts are triggered.