Stabilize part of SDK spec for synchronous instrument Enabled

CHANGELOG.md

@@ -13,6 +13,9 @@ release.
 
 ### Metrics
 
+- Stabilize part of `Enabled` SDK for synchronous instruments.
+  ([#4787](https://github.com/open-telemetry/opentelemetry-specification/pull/4787))
+
 ### Logs
 
 ### Baggage

specification/metrics/sdk.md

@@ -872,6 +872,10 @@ It consists of the following parameters:
   is [Enabled](./api.md#enabled). See [Instrument Enabled](#instrument-enabled)
   for details.
 
+It is not necessary for implementations to ensure that changes to any of these
+parameters are immediately visible to callers of `Enabled`.
+However, the changes MUST be eventually visible.
+
 ### Duplicate instrument registration
 
 A _duplicate instrument registration_ occurs when more than one Instrument of
@@ -997,13 +1001,12 @@ must be retained.
 
 ### Instrument enabled
 
-**Status**: [Development](../document-status.md)
-
-The instrument [`Enabled`](./api.md#enabled) MUST return `false` when either:
+The synchronous instrument [`Enabled`](./api.md#enabled) MUST return `false`
+when either:
 
-* The [MeterConfig](#meterconfig) of the `Meter` used to create the instrument
-  has parameter `disabled=true`.
-* All [resolved views](#measurement-processing) for the instrument are
+- **Status**: [Development](../document-status.md) - The [MeterConfig](#meterconfig)
+  of the `Meter` used to create the instrument has parameter `disabled=true`.
+- All [resolved views](#measurement-processing) for the instrument are
   configured with the [Drop Aggregation](#drop-aggregation).
 
 Otherwise, it SHOULD return `true`.
@@ -1013,10 +1016,6 @@ Note: If a user makes no configuration changes, `Enabled` returns `true` since b
 default `MeterConfig.disabled=false` and instruments use the default
 aggregation when no matching views match the instrument.
 
-It is not necessary for implementations to ensure that changes
-to `MeterConfig.disabled` are immediately visible to callers of `Enabled`.
-However, the changes MUST be eventually visible.
-
 ## Attribute limits
 
 **Status**: [Stable](../document-status.md)

specification/trace/sdk.md

@@ -212,9 +212,9 @@ It consists of the following parameters:
   is [Enabled](./api.md#enabled). If `disabled` is `true`, `Enabled`
   returns `false`. If `disabled` is `false`, `Enabled` returns `true`.
 
-  It is not necessary for implementations to ensure that changes to `disabled`
-  are immediately visible to callers of `Enabled`.
-  However, the changes MUST be eventually visible.
+It is not necessary for implementations to ensure that changes to any of these
+parameters are immediately visible to callers of `Enabled`.
+However, the changes MUST be eventually visible.
 
 ### Enabled