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Upcoming change to the Classic Application Load Balancer

Few Days ago I got a mail regarding the Changes in the HTTP/2 requests that the load balancer will start rejecting the request which are not following the specific path or characters, So if I want to check with the current load balancer logs that which of the URL is being affected from this how can i do this. Please someone guide me as I am new in the GCP. 

The snippet of the mail

If the request path contains invalid characters, the request will be rejected with the following response details:

Response code: 400 Status detail: invalid_http2_client_request_path

If the request path contains invalid characters, the request will be rejected with the following response details:
also I have got this mail for only one load balancer I have 3 projects and all of them have the load balancer so does that mean that I will have issue on that specific load balanacer only?

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