StrongSwan detected on my Raspberry Pi without having installed it myself.

I have just seen that StrongSwan is installed and the service is enabled on my Raspberry Pi. But I have never used Strongswan before. Is there any way to research when it was installed? I just use the Raspi for OMV 5 with Portainer and various Docker containers. Should I be concerned that the package is installed without my active action?

EDIT:

I did some further investigation and found this commands in my .bash_history. This was approximately one year ago. Maybe I wanted to test something that I cannot remember. But interesting that despite those apt purge commands strongswan was still installed and running.

sudo apt install strongswansudo apt install strongswan-pkisudo apt install libstrongswan-extra-pluginssudo apt purge strongswansudo apt purge strongswan-pkisudo apt purge libstrongswan-extra-plugins