Initially (#1 in Figure 4.3), the application development team alone builds and runs the software in production until the scale merits SRE help. During a second stage (#2 in Figure 4.3), as the application usage increases, SRE provides guidance (represented in green) to the application development team on how to make the application work better at global scale. Later, SRE becomes fully involved by running and supporting the application (but still collaborating with the application team) when the scale merits it (#3 in Figure 4.3). At this point, the product owner for the application must
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