Remove view file config mechanism (#8394)

Author: jack-berg

sdk-extensions/incubator/README.md

@@ -6,99 +6,3 @@ This artifact contains experimental code related to the trace and metric SDKs.
 
 > [!WARNING]
 > Relocated to [opentelemetry-sdk-extensions-declarative-config](../declarative-config)
-
-## View File Configuration
-
-> [!WARNING]
-> This mechanism is superseded by declarative config, which is now stable (spec and schema at [opentelemetry-configuration](https://github.com/open-telemetry/opentelemetry-configuration)) and will be removed after the 1.62.0 release. Please use [declarative configuration](#declarative-configuration) instead.
-
-Adds support for file based YAML configuration of Metric SDK Views.
-
-For example, suppose `/Users/user123/view.yaml` has the following content:
-
-```yaml
-- selector:
-    instrument_name: my-instrument
-    instrument_type: COUNTER
-    instrument_unit: ms
-    meter_name: my-meter
-    meter_version: 1.0.0
-    meter_schema_url: http://example.com
-  view:
-    name: new-instrument-name
-    description: new-description
-    aggregation: explicit_bucket_histogram
-    aggregation_args:
-      bucket_boundaries: [1.0, 2.0, 5.0]
-    attribute_keys:
-      - foo
-      - bar
-```
-
-The equivalent view configuration would be:
-
-```
-SdkMeterProvider.builder()
-   .registerView(
-       InstrumentSelector.builder()
-           .setName("my-instrument")
-           .setType(InstrumentType.COUNTER)
-           .setUnit("ms")
-           .setMeterName("my-meter")
-           .setMeterVersion("1.0.0")
-           .setMeterSchemaUrl("http://example.com")
-           .build(),
-       View.builder()
-           .setName("new-instrument")
-           .setDescription("new-description")
-           .setAggregation(Aggregation.explicitBucketHistogram(Arrays.asList(1.0, 2.0, 5.0))
-           .setAttributesFilter(key -> new HashSet<>(Arrays.asList("foo", "bar")).contains(key))
-           .build());
-```
-
-If using [autoconfigure](../autoconfigure) with this artifact on your classpath, it will automatically load a list of view config files specified via environment variable or system property:
-
-| System property                       | Environment variable                  | Purpose                                              |
-|---------------------------------------|---------------------------------------|------------------------------------------------------|
-| otel.experimental.metrics.view-config | OTEL_EXPERIMENTAL_METRICS_VIEW_CONFIG | List of files containing view configuration YAML [1] |
-
-**[1]** In addition to absolute paths, resources on the classpath packaged with a jar can be loaded.
-For example, `otel.experimental.metrics.view-config=classpath:/my-view.yaml` loads the
-resource `/my-view.yaml`.
-
-If not using autoconfigure, a file can be used to configure views as follows:
-
-```
-SdkMeterProviderBuilder builder = SdkMeterProvider.builder();
-try (FileInputStream fileInputStream = new FileInputStream("/Users/user123/view.yaml")) {
-  ViewConfig.registerViews(builder, fileInputStream);
-}
-```
-
-The following table describes the set of recognized aggregations:
-
-| Aggregation                      | Arguments                                                                                                                      |
-|----------------------------------|--------------------------------------------------------------------------------------------------------------------------------|
-| [`default`]                      | -                                                                                                                              |
-| [`sum`]                          | -                                                                                                                              |
-| [`last_value`]                   | -                                                                                                                              |
-| [`drop`]                         | -                                                                                                                              |
-| [`explicit_bucket_histogram`]    | `bucket_boundaries` (optional): List of inclusive upper boundaries for the histogram buckets, in order from lowest to highest. |
-| [`exponential_bucket_histogram`] | `max_buckets` (optional): The maximum number of buckets to use for positive or negative recordings.                            |
-
-Additional notes on usage:
-
-- Many view configurations can live in one file. The YAML is parsed as an array of view
-  configurations.
-- At least one selection field is required, but including all is not necessary. Any omitted fields
-  will result in the default from `InstrumentSelector` being used.
-- At least one view field is required, but including all is not required. Any omitted fields will
-  result in the default from `View` being used.
-- Instrument name selection supports the following wildcard characters: `*` matches 0 or more instances of any character; `?` matches exactly one instance of any character. No other advanced selection criteria is supported.
-
-[`default`]: https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/metrics/sdk.md#default-aggregation
-[`sum`]: https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/metrics/sdk.md#sum-aggregation
-[`last_value`]: https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/metrics/sdk.md#last-value-aggregation
-[`drop`]: https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/metrics/sdk.md#drop-aggregation
-[`explicit_bucket_histogram`]: https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/metrics/sdk.md#explicit-bucket-histogram-aggregation
-[`exponential_bucket_histogram`]: https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/metrics/sdk.md#base2-exponential-bucket-histogram-aggregation

sdk-extensions/incubator/build.gradle.kts

@@ -17,9 +17,7 @@ dependencies {
 
   compileOnly(project(":api:incubator"))
 
-  // io.opentelemetry.sdk.extension.incubator.metric.viewconfig
   implementation(project(":sdk-extensions:autoconfigure-spi"))
-  implementation("org.snakeyaml:snakeyaml-engine")
 
   testImplementation(project(":sdk:testing"))
   testImplementation(project(":sdk-extensions:autoconfigure"))