IssueTracker

This will create a feature request which anybody can view and comment on.

Please describe your requested enhancement. Good feature requests will solve common problems or enable new use cases.

What you would like to accomplish:
Populate metadata fields as environmental variables. Obviously this wouldn't work for values that might change during the lifetime of a container (such a service account token), but for container-life-long values, such as instance id, this can be very helpful.

How this might work:
When a container is instantiated, dynamically inject environmental variables.

If applicable, reasons why alternative solutions are not sufficient:
Currently, calls to the metadata server are asynchronous and can also suffer from latency. Prepopulating these values will make them instantly available.

Other information (workarounds you have tried, documentation consulted, etc):
Some variables can be pre-populated by the user (such as project id), but others cannot (such as instance id).

Thanks!