Support Deprecation header#1151

Draft

MGessinger wants to merge 19 commits intodotnet:mainfrom

MGessinger:support-deprecation-header

Commits on Dec 29, 2025

Extract base class for LinkList
Matthias Gessinger
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Add DeprecationPolicy class
Matthias Gessinger
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Extract PolicyBuilder base interface
Matthias Gessinger
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Extract LinkBuilder base class
Matthias Gessinger
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Implement DeprecationPolicyBuilder
Matthias Gessinger
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Add deprecation policy to ApIVersionPolicyBuilder
Matthias Gessinger
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Extract PolicyManager base class
Matthias Gessinger
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Implement DeprecationPolicyManager
Matthias Gessinger
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Emit Deprecation header when policy is set
Matthias Gessinger
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Pass DeprecationPolicyManager through all service layers
Matthias Gessinger
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Include DeprecationPolicy in Swagger generation
Matthias Gessinger
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Fix compile errors in netstandard
Matthias Gessinger
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Pass relation type to LinkList to avoid subclassing
Matthias Gessinger
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Don't initialize LinkList internally unless necessary
Matthias Gessinger
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Remove marker interfaces for ISunsetPolicyBuilder and IDeprecationPolicyBuilder
Matthias Gessinger
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Backport DateTimeOffset.ToUnixTimeSeconds
Matthias Gessinger
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Explicitly check for existence of links before formatting
Matthias Gessinger
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Simplify constructors
Matthias Gessinger
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Check for ordering of effective dates of policies
Matthias Gessinger
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