During Day 4 of GrafanaCONline 2021, several presentations showcased the versatile applications of Grafana in various fields, particularly focusing on real-time streaming in Grafana 8 for IoT projects. Ryan McKinley highlighted Grafana's enhancements for industrial and IoT use, including Grafana Live for broadcasting real-time data. Ed Welch and Ivana Huckova shared easy DIY IoT projects using Grafana, while Martin Klimmek and Haluk Tutuk discussed Siemens Mobility's use of Grafana for train data analysis. Grant Pinkos outlined how Grafana Cloud aids in improving manufacturing efficiency at American Metal Processing. Mat Schaffer from Safecast demonstrated how Grafana dashboards are used to visualize environmental data. Additionally, a panel discussed careers in open source, emphasizing the value of mentorship and community contributions in Grafana Labs.