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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.
If that isn't possible, you could use ipset blocklists (https://github.com/firehol/blocklist-ipsets) regularly updated to geoblock and add some level of security from active attacks.
Use CrowdSec (https://crowdsec.net/) as an additional layer of security/detection.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.