add readme

Author: zeitlinger

baggage-processor/README.md

@@ -25,6 +25,37 @@ processors through configuration.
 | `otel.java.experimental.span-attributes.copy-from-baggage.include` | Add baggage entries as span attributes, e.g. `key1,key2` or `*` to add all baggage items as keys. |
 | `otel.java.experimental.log-attributes.copy-from-baggage.include`  | Add baggage entries as log attributes, e.g. `key1,key2` or `*` to add all baggage items as keys.  |
 
+### Usage with declarative configuration
+
+You can configure the baggage span and log record processors using declarative YAML configuration with the OpenTelemetry SDK.
+
+For the tracer provider (span processor):
+
+```yaml
+file_format: 1.0-rc.1
+tracer_provider:
+  processors:
+    - baggage:
+        included: [foo]
+        excluded: [bar]
+```
+
+For the logger provider (log record processor):
+
+```yaml
+file_format: 1.0-rc.1
+logger_provider:
+  processors:
+    - baggage:
+        included: [foo]
+        excluded: [bar]
+```
+
+This will configure the respective processor to include baggage keys listed in `included` and 
+exclude those in `excluded` as explained in 
+[Properties which pattern matching
+](https://github.com/open-telemetry/opentelemetry-configuration/blob/main/CONTRIBUTING.md#properties-which-pattern-matching).
+
 ### Usage through programmatic activation
 
 Add the span and log processor when configuring the tracer and logger providers.

baggage-processor/src/test/java/io/opentelemetry/contrib/baggage/processor/BaggageLogRecordComponentProviderTest.java

@@ -18,7 +18,7 @@ class BaggageLogRecordComponentProviderTest {
   @Test
   void declarativeConfig() {
     String yaml =
-        "file_format: 0.4\n"
+        "file_format: 1.0-rc.1\n"
             + "logger_provider:\n"
             + "  processors:\n"
             + "    - baggage:\n"

baggage-processor/src/test/java/io/opentelemetry/contrib/baggage/processor/BaggageSpanComponentProviderTest.java

@@ -18,7 +18,7 @@ class BaggageSpanComponentProviderTest {
   @Test
   void declarativeConfig() {
     String yaml =
-        "file_format: 0.4\n"
+        "file_format: 1.0-rc.1\n"
             + "tracer_provider:\n"
             + "  processors:\n"
             + "    - baggage:\n"