Provide some guidelines for observable instruments.

### Type of issue

Missing information

### Description

[Enter feedback here]
Hi, as far as I understand the callbacks for observable instruments run concurrently with the code which updates the metrics.

Should I account for it and use synchronization prmitives like `Interlocked.Read(ref _consecutiveExceptionsCount))` to return a value for the measurement?

### Page URL

https://learn.microsoft.com/en-us/dotnet/core/diagnostics/metrics-instrumentation

### Content source URL

https://github.com/dotnet/docs/blob/main/docs/core/diagnostics/metrics-instrumentation.md

### Document Version Independent Id

02ec1bf2-d0fe-dac5-b2c1-45d607430b06

### Article author

@tommcdon

### Metadata

* ID: 61024acd-c2e8-291a-3007-7f09a1857690
* Service: **dotnet-fundamentals**