The rate at which this receiver will poll Okta for logs. This value must be in the range [1 second - 24 hours] and must be a string readable by Golang’s time.ParseDuration. Okta recommends between 60s - 300s.
Depending on your Okta plan, setting the poll_interval below 10 seconds risks your API Token getting rate limited. You can increase the rate limit allocated to your API Token to minimize the chances of getting rate limited while using a short poll_interval. Okta - Set Token Rate Limits