aspnetcore (original) (raw)

Backport of #59543 to release/9.0

Redis distributed cache: add HybridCache usage signal

Add connection usage marker for HybridCache to improve connection metadata / visibility.

Description

{Detail}

We already use "DC" and "OC" markers on RESP connections to provide a non-intrusive signal that Distributed Cache and Output Cache are being used; since HybridCache is a feature on top of IDistributedCache, here we add an additional "HC" token to indicate that a RESP connection is being used for HybridCache.

We do this by using IServiceProvider (changing the internal RedisCacheImpl(...) constructors) to detect HybridCache as a service. We don't need it to be the official HybridCache specifically (as in .AddHybridCache()) - just that a HybridCache exists. There are no public API or dependency changes required.

Customer Impact

Improves connection metadata / visibility, i.e. we know what different Redis connections are being used for.

No API changes. Improves internal metrics.

Regression?

[If yes, specify the version the behavior has regressed from]

Risk

High
Medium
Low

[Justify the selection above]

Verification

Manual (required)
Automated

Packaging changes reviewed?

When servicing release/2.1

Make necessary changes in eng/PatchConfig.props