Required IOPS for WordPress Installation

Hello Sirs,

NOTE: I’m not an AWS professional so I might mention some terminologies here that might sound incorrect. Please correct me if needed. Thanks!

I only have basic knowledge about Linux servers, but I have access to SSH.

Sorry for the lengthy topic. I badly need help. I appreciate your help here.

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I have developed a website which is hosted in AWS servers. I was not the one who setup the architecture part in AWS. Here’s the diagram of the architecture: https://prnt.sc/xwnaws. I just installed the web servers (Apache, PHP etc) using an online guide and since then, the website was running smoothly.

Basically, the 2 servers’s public_html folders are mounted in EFS. I don’t have direct access to AWS console but as I remember the size of both servers are t2.large.

HERE’S MY PROBLEM:
Recently, I keep getting a downtime report from Uptime Robot. The downtime lasts usually for about 5 mins and get up and running again. At first, the downtime frequency was low but time came that it happened almost every 30 minutes. When someone investigated the issue, they say that there’s an IOPS issue and they had to detach the other server from the target group. Now the website is running and no downtime is being reported.

They asked me to give the IOPS needed for my WordPress application so they can adjust the server’s configuration accordingly.

MY QUESTIONS:
How can I know the needed IOPS for my application?
Is there any Linux command that I can run so I can know this information?

Here’s my WordPress Installation details:
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Wordpress version: WordPress 5.3.2

Plugins Installed:

Admin Menu Editor
Advanced Custom Fields
All In One WP Security
Anps Theme plugin
Asset CleanUp: Page Speed Booster
Benefit for Woocommerce
Better Notifications for WP
Categories Images
Classic Editor
Coming Soon Page, Under Construction & Maintenance Mode by SeedProd
Contact Form 7
Contact Form 7 Datepicker
Custom Options Plus
Custom Post Type UI
Duplicate Post
Duplicate Widgets
Edit Flow
EventON
EventON – Full cal
Exit Notifier
Heartbeat Control by WP Rocket
Newsletter
Popup Maker
Product Input Fields for WooCommerce
Purchase Order Gateway for WooCommerce
Really Simple SSL
ReCaptcha v2 for Contact Form 7
Responsive Posts Carousel
Restrict User Access
Search Regex
Site Last Modified
Slider Revolution
To Top
Ultimate Addons for WPBakery Page Builder
Ultimate Member
Ultimate Member – reCAPTCHA
W3 Total Cache
Widget CSS Classes
Widgets On Pages
WooCommerce
WooCommerce Multilingual
WooCommerce Purchase Order Upload AddOn
WP Clone Menu
WP Mail SMTP
WP Sticky Sidebar
WPBakery Page Builder
WPML Media
WPML Multilingual CMS
WPML String Translation
WPML Translation Management
WPML Widgets
YITH WooCommerce Request A Quote Premium
Yoast SEO
Zeno Font Resizer
Zeno Font Resizer Shortcode

Web Server’s Details:
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Server version: Apache/2.4.41 ()
Server built: Oct 22 2019 22:59:04

PHP 7.2.24 (fpm-fcgi) (built: Oct 31 2019 18:30:51)
Copyright (c) 1997-2018 The PHP Group
Zend Engine v3.2.0, Copyright (c) 1998-2018 Zend Technologies
with Zend OPcache v7.2.24, Copyright (c) 1999-2018, by Zend Technologies

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I appreciate it if you can give me your recommendation on my problem.