Add a section, or new page, for Metrics, - with examples

### Description

One of the key features of a cache is to know it's performance.

Is the cache faster or slower than the real call ?
What is the cache hit/miss ratio ? A small cache hit percentage questions the need for caching in the first place.

(new for this hybrid pattern)
What is the number of nodes that have inconsistent data between In-Memory and Distributed stores ? If the data is frequent out of sync it's a clue to either reduce your cache expiration or too unstable to cache in the first place.

Your consumers will need data to make informed decisions.

We also need to know what hooks are available to influence reporting, if any. A black box only approach is frustrating. If there are Dependency Injection "hooks", please also document them.

### Page URL

https://learn.microsoft.com/en-us/aspnet/core/performance/caching/hybrid?view=aspnetcore-9.0

### Content source URL

https://github.com/dotnet/AspNetCore.Docs/blob/main/aspnetcore/performance/caching/hybrid.md

### Document ID

fdd3c6f2-c3f4-6fc7-0928-0b18ba9297cf

### Article author

@tdykstra

[Related Issues](https://github.com/dotnet/AspNetCore.Docs/issues?q=is%3Aissue+is%3Aopen+fdd3c6f2-c3f4-6fc7-0928-0b18ba9297cf)

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