The following illustration explains the Template and Application relationship and is true for all templates, including all AppInsight applications.
If you change a configuration setting or component monitor at the template level, the applications based on that template are affected. Conversely, if you change a configuration setting on the application level, only that application is affected. This inheritance relationship is beneficial if you need to make a great deal of changes quickly.
For example, rather than change one item on 100 applications that are based on a single template (which requires 100 changes), you can more easily change the one item on the template. That one change in the template trickle down to all 100 applications that are based on the template.