@Abhi2424shek told me this:
I saw you would be cloning all the repos, won't that be a overdeal?
@niccokunzmann to get the commit description:
When a org registers a repo, use the github api to fetch the last 5000 commits then take the last commits timestamp from the api and make another call with parameter since with the value of the timestamp you got earlier. Then capture the next 5000 and repeat this procedure. You wont need to query the commits again, and again from the first you would only need to query the unqueried ones which can be got using the from parameter with the timestamp of the latest commit you queried.