Our E commerce site received 16000 requests and caused it to crash

our [login to view URL] website on March 13 at 6 AM Pacific time received over 16000 requested. Here's what we observed 1- Site traffic increased significantly around 6am Pacific time this morning. Your site normally gets several hundred requests hourly but it jumped to 16000 requests. 2- CPU usage also jumped a lot (at least 3 times) 3- Memory usage also spiked from around 300MB average to close to 900MB I need an expert such as a full stack developer to help us diagnosis and solve the issue. Also I need to know if theses 16000 requests are legit or attack. I also attached a screen shot displaying few error messages that keeps on generating when clients try to click on March 2021 Firepit reservation. and we also noticed that theses error message are being generated all the time. However it crashes the site when we have tremendous traffic to the site. we need an expert to fix it Please view both attachment files to understand the issue