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docs: propose deprecating the global Viper instance

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Signed-off-by: Mark Sagi-Kazar <mark.sagikazar@gmail.com>
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docs/adr/0005-deprecate-setters-in-favor-of-functional-options-during-initialization.md
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Proposed
Referenced by [8. Deprecate the global Viper instance](0008-deprecate-the-global-viper-instance.md)
## Context
The Viper struct currently acts as a facade for reading, writing and watching configuration for changes.

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# 8. Deprecate the global Viper instance
Date: 2021-09-23
## Status
Proposed
References [5. Deprecate setters in favor of functional options during initialization](0005-deprecate-setters-in-favor-of-functional-options-during-initialization.md)
## Context
With the deprecation of setters in favor of functional options, it becomes almost impossible to get away with instantiating Viper.
In addition to that, people should be discouraged from accessing a global Viper instance.
## Decision
Deprecate the global Viper instance and the global access functions.
## Consequences
People will still be able to create a global instance of their own,
but instantiating a custom Viper instance will become the primary solution for using Viper.