In this chapter, we covered the monitoring aspect of Ceph, including cluster monitoring and monitoring of different Ceph components such as MON, OSD, and MDS. We also learned about monitoring placement groups, including their various states. The states of placement groups are very much dynamic and require keen monitoring. Most of the changes that happen on a Ceph cluster are in its placement groups. This chapter also covered some open source GUI monitoring dashboard projects such as Kraken and ceph-dash. These projects are separate from the Ceph community, managed and developed by individual efforts, yet they are open source, so you can contribute to these projects. We also covered an overview of Calamari, which is a management and monitoring service for Ceph, which has been recently open sourced by Red Hat (Inktank). In the next chapter, we will learn about how Ceph extends its benefits to cloud platforms such as OpenStack. We will also focus on integrting Ceph with OpenStack.