sess_ creation

First off, I’m just an ordinary WP blogger and know nothing about php.

Two days ago, my site got 503 and my host told me that I’m hitting my inodes limit. Apparently, my blog created a lot of sess_ files, thousands of them over the course of many months.

Now, when I open one of these sess_ files, I see this in the beginning of the file

wpdiscuz_users|a:3:{s:37:"0_5c08b653f0e24@example.com_Anonymous";a:8:{s:4:"user";b:0;s:16:"commentAuthorUrl";s:0:"";s:10:"authorName";s:9:"Anonymous";s:10:"profileUrl";s:0:"";s:11:"authorClass";s:13:"wc-blog-guest";s:12:"author_title";s:5:"Guest";s:12:"gravatarArgs";a:5:{s:23:"wpdiscuz_gravatar_field";s:25:"5c08b653f0e24@example.com";s:22:"wpdiscuz_gravatar_size";i:64;s:25:"wpdiscuz_gravatar_user_id";i:0;s:28:"wpdiscuz_gravatar_user_email";s:25:"5c08b653f0e24@example.com";s:21:"wpdiscuz_current_user";b:0;}s:6:"avatar";s:209:"<img src="https://www.webbline.com/wp-content/uploads/2018/11/Blank_avatar-186x186.jpeg" width="64" height="64" alt="Anonymous" class="avatar avatar-64 wp-user-avatar wp-user-avatar-64 photo avatar-default"

Every single one of them. Does this plugin creates these files? Are they suppose to stay forever or deleted after use?

Thanks.