Firewall Events issue

Hi, my firewall activity log shows some attacks. Action taken is challenge. What does that mean?. Till now i had more than 10 Attacks. All attacks has common URI:/wp-login.php. My website ranking is decreased(nearly 1200) during those attacks. Can i use user agent blocking or IP access rules or any of your other tools to block them and how?.
Also, there is one more attack i.e browser integrity check with URI: /robots.txt and User agent is: Python-urllib/1.17. Action taken is blocked. Is it Google that’s tracking it or it’s a fake hacker?.
Hoping you would solve this problem.
Thank you

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