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crowdsec
CrowdSec - the open-source and participative security solution offering crowdsourced protection against malicious IPs and access to the most advanced real-world CTI.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
Depending on what you want to do with your VPS, it might make sense to take a look at CrowdSec, which is free, open source, crowdsourced threat intelligence. Think of it as an improved and modern version of fail2ban (even though it can do so much more). The really cool thing about it is that is (anonymously) shares threat intelligence from all users so that attackers attacking others in the ecosystem will be automatically blocked. It does what you would expect fail2ban to do but has much more advanced logic and is capable of detecting abnormal behavior (using rulebased approach, no AI/ML ftw). That is a bit fluffy but it means that exfiltrating data, botscraping, DDoS and much more can also be detected and blocked either on L3 via host firewall (iptables, nftables or pf) or on L7 via nginx, cloudflare, wordpress, any php app and more.