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How to filter http logs to identify DDOS

I would like with the intention to glance through my proxy logs and spot if I will perceive viable abuse to my websites. I'm extra of a developer than a sysop so could recognize some basic statistics on how to filter out my logs finding some occurrences for requests from the same IP addresses, i.e.

189.291.289.29 - 105 requests

189.101.89.11  - 85 requests