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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.
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Wazuh
Wazuh - The Open Source Security Platform. Unified XDR and SIEM protection for endpoints and cloud workloads.
Grafana Loki, arguably a bit more complicated to setup than Graylog, but if you're already using Grafana for dashboards then it's pretty nice, and also uses less resources for small deployments. See https://github.com/grafana/loki/blob/main/production/docker-compose.yaml
If you use docker, I would recommend fizzle : https://dozzle.dev/ It works very well and is easy to install.
Simple - just use Wazuh -(https://wazuh.com) based on Elasticsearch and does both SEIM and XDR.