Incremental increase in memory usage

I installed Splunk Add-on for Google Cloud Platform and set it up like this, and it keeps increasing until the memory usage reaches 99% at around 15% per day. I haven’t found any specific reason, but it’s been happening since I set it up for collection in that app. Is there anything wrong with that app?

Splunk Add-on for Google Cloud Platform 4.7.2
Average daily collection: 10G

[Setting up]
input type : Cloud Pub/Sub Based Bucket
Number of Threads : 10
Interval: 0

[system env]
CPU: Intel (R) Xeon (R) Platinum 8488C, 8Cores
Memory : 32 G