Hi all,

Is there a way to create template variables (e.g. 'ds', 'ds_nodash', etc.) that 
are available to every situation where Airflow renders templates? Or otherwise 
is there a best practice on providing these?

My motivation is I am developing an Airflow environment for my business users. 
To make it easy for them I have created several custom date variables (they are 
set at the end of the tasks processing period in the timezone of the DAG)  that 
they can access so they don't have to write their own date logic.

My current implementation is to subclass all the operators and sensors I need 
and to override the render_template and execute method injecting the extra 
variables in to the context dictionary. This has 2 major drawbacks, it needs to 
be done for every Operator and Sensor we are using, and it is not available to 
logic outside Operators and Sensors such as setting email alert configuration: 
https://airflow.apache.org/concepts.html#email-configuration

Thanks for any input,
Damian

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