The fight against DDoS attacks continues, with assaults occurring every day

Hello, yesterday I received another DDoS attack, with nearly two million different IPs. The cloud stopped it, so they say, but my website still went offline. Therefore, I have some questions for you. In the activity log, it shows the time of the attack.
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First question, does the blue line in the picture indicate that the IPs were blocked? So, does ‘blocked’ mean that they didn’t reach my server? Because my server went offline, if in the picture, it blocked the attack, how did it reach my server?
–Ho usato il comando netstat -tn | awk ‘$4 ~ /:3[0-9]{4}$/ || $4 ~ /:4[0-9]{4}$/ || $4 ~ /:5[0-9]{4}$/’ | awk ‘{print $5 “:” $4}’
e ieri mi vedevo centinaia di ip collegati a delle porte chiuse del mio server

172.71.114.193:25544:37.187.54.25:52223
37.187.54.25:443:127.0.0.1:49096
37.187.54.25:443:127.0.0.1:48978
172.71.114.208:11110:37.187.54.25:52223
37.187.54.25:443:127.0.0.1:36818
172.69.43.173:53162:37.187.54.25:52223
172.71.99.176:47832:37.187.54.25:52223
37.187.54.25:443:127.0.0.1:49080
188.114.102.228:58734:37.187.54.25:52223
172.70.90.64:44256:37.187.54.25:52223
37.187.54.25:443:127.0.0.1:48966
37.187.54.25:443:127.0.0.1:57814
172.70.90.65:56248:37.187.54.25:52223
37.187.54.25:443:127.0.0.1:46390
172.71.114.101:63272:37.187.54.25:52223
37.187.54.25:443:127.0.0.1:49050
37.187.54.25:443:127.0.0.1:57806
172.70.46.48:42344:37.187.54.25:52223
188.114.102.209:50212:37.187.54.25:52223
37.187.54.25:443:127.0.0.1:49140
141.101.76.64:12984:37.187.54.25:52223
37.187.54.25:443:127.0.0.1:49062
37.187.54.25:443:127.0.0.1:49004
37.187.54.25:443:127.0.0.1:48954
172.71.99.186:13572:37.187.54.25:52223
37.187.54.25:443:127.0.0.1:48988
37.187.54.25:443:127.0.0.1:49088
37.187.54.25:443:127.0.0.1:51710
162.158.129.164:52672:37.187.54.25:52223
172.70.160.168:36514:37.187.54.25:52223
162.158.129.33:21436:37.187.54.25:52223
37.187.54.25:443:127.0.0.1:49018
37.187.54.25:443:127.0.0.1:48984
188.114.102.53:45478:37.187.54.25:52223
37.187.54.25:443:127.0.0.1:49146
37.187.54.25:443:127.0.0.1:49102
188.114.102.226:37674:37.187.54.25:52223
172.69.43.189:39034:37.187.54.25:52223
37.187.54.25:443:127.0.0.1:48972
172.71.114.101:52550:37.187.54.25:52223
37.187.54.25:443:127.0.0.1:49094
37.187.54.25:443:127.0.0.1:49042
37.187.54.25:443:127.0.0.1:48962
172.69.195.53:11738:37.187.54.25:52223
37.187.54.25:443:127.0.0.1:49104
37.187.54.25:443:127.0.0.1:48964
2606:4700:3032::681:443:2001:41d0:401:320:50846
2a01:4f8:171:236b:::443:2001:41d0:401:320:48548
2a01:4f8:191:7199:::443:2001:41d0:401:320:58704
2a01:4f8:191:7199:::443:2001:41d0:401:320:58696

My website is heavily fortified, so why did it still go offline? Can someone enlighten me? Thanks. My server has 8 cores and 36 GB of RAM.