Graylog is a centralized log management tool built for capturing, storing, and enabling real-time analysis of terabytes of machine data. Here is how you can install graylog in Ubuntu 20.04
Elasticsearch is a distributed, open-source search and analytics engine for all types of data, including textual, numerical, geospatial, structured, and unstructured. Elasticsearch is fast, distributed by nature. Here you can find steps to install elasticsearch.