Netlify Pro Plan features- Serverless Functions and Log Drains

We wanted to understand about the serverless functions and log drains of Netlify pro plan. We believe for the pro plan of netlify there is a limit of 125k requests per site/month. We wanted to know what happens in the case when the 125k limit is exceeded. What are the charges post this and also if there is a max limit to the serverless functions usage.
Secondly for the log drains in the case of pro plan nothing is mentioned. So we wanted to know if it is possible to setup a log drain with a third party like Newrelic using the pro plan and if yes, would there be a limit on the amount of data that would be drained.

Question 1 - Serverless Functions

The pricing can be found here:

When the limit of 125k is exceeded it’s a $25 charge.
(Netlify will need to clarify how much additional usage the $25 covers, as the table isn’t clear.)

Question #2 - Log Drains

Log Drains are only available on an Enterprise Plan.
They don’t apply to the Pro Plan.

Functions cost is:
Level 0 ($0) = 0-125k
Level 1 ($25) = 125k - 2M
+2M = Additional packs of 500K ($19/500k)