Elasticsearch Series ELK
If you ever managed a Linux server or developed application for it; you probably know about Splunk; it captures, indexes and correlates real-time data in a searchable repository from which it can generate graphs, reports, alerts, dashboards and visualizations. There exists free version that one can try out or even use in production, it comes with 500Mb / day indexing limit, which is enough for many applications. Splunk also has API and allows third party applications, there is even official C# SDK in case its your preferred development platform; seeing the Github activity of its repository seems like nothing much going on there lately. There exists an open source and much better alternative; Elasticsearch. Its open source, actively developed and maintained, strong community and ecosystem and offers not one but two .NET client libraries NEST and Elasticsearch.NET and they are actively maintained and developed.