Seconded! In the current world where dashboards are coupled to alerts, it's very frustrating not to be able to define alerts on a templated dashboard.
It's also frustrating that it's effectively impossible with the Cloudwatch data source to select resources to alert on using their tags (e.g. select the elb with app=foo and env=prod). The dimension_values() function lets you filter based on tags, but instead of being usable directly in a panel's query it requires using a variable as an intermediary, which then disables alerting.
It's also frustrating that it's effectively impossible with the Cloudwatch data source to select resources to alert on using their tags (e.g. select the elb with app=foo and env=prod). The dimension_values() function lets you filter based on tags, but instead of being usable directly in a panel's query it requires using a variable as an intermediary, which then disables alerting.