Alan M. Carroll created TS-3650:
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Summary: Configuration variables should track their source
Key: TS-3650
URL: https://issues.apache.org/jira/browse/TS-3650
Project: Traffic Server
Issue Type: Improvement
Components: Configuration
Reporter: Alan M. Carroll
A configuration variable can get its value from a variety of sources. It would
be useful to be able to programmatically determine that source. At a minimum
the ability to determine if a variable was set explicitly in a configuration
file vs. using a built in default value would be very useful.
In addition this information should be made available to the administrator via
{{traffic_ctl}} to aid in debugging.
The proposed values are
* {{DEFAULT}} - built in default, hard wired.
* {{FILE }}- read from a configuration file.
* {{API}} - set via an API of some sort ({{traffic_line}} etc.)
* {{CLUSTER}} - set via cluster configuration
* {{ENV}} - set from an environment variable
In addition the value {{INVALID}} will be defined to use for the internal API,
primarily as a value to return if the requested variable doesn't exist (in
which case none of the previous values are reasonable).
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