Observability ( o11y ) is a practice that helps provide better insights into application behaviour, to enable the earlier identification and rectification of application defects. Most developers come across o11y when assigned a bug report from IT OPS with a log file attached, this log file usually contains any information that has been pumped to stdout() !! .... usually not that helpful. There is a lot more to o11y than this. Using concrete examples this session we will go through what developers should know to improve their applications observability when running on AWS. We will highlight some best practices, tools and services that you can leverage to help with observability on various application stacks.