chore: traces documentation (#3195)

Author: surbhigarg92

.readme-partials.yaml

@@ -183,6 +183,7 @@ custom_content: |
   
   > Note: The attribute keys that are used for additional information about retry attempts and the number of requests might change in a future release.
 
+
   ### Instrument with OpenCensus
 
   > Note: OpenCensus project is deprecated. See [Sunsetting OpenCensus](https://opentelemetry.io/blog/2023/sunsetting-opencensus/).
@@ -315,6 +316,38 @@ custom_content: |
 
   Spanner spanner = options.getService();
   ```
+  
+  #### OpenTelemetry SQL Statement Tracing
+  The OpenTelemetry traces that are generated by the Java client include any request and transaction
+  tags that have been set. The traces can also include the SQL statements that are executed and the
+  name of the thread that executes the statement. Enable this with the `enableExtendedTracing`
+  option:
+
+  ```
+  SpannerOptions options = SpannerOptions.newBuilder()
+    .setOpenTelemetry(openTelemetry)
+    .setEnableExtendedTracing(true)
+    .build();
+  ```
+
+  This option can also be enabled by setting the environment variable
+  `SPANNER_ENABLE_EXTENDED_TRACING=true`.
+
+  #### OpenTelemetry API Tracing
+  You can enable tracing of each API call that the Spanner client executes with the `enableApiTracing`
+  option. These traces also include any retry attempts for an API call:
+    
+  ```
+  SpannerOptions options = SpannerOptions.newBuilder()
+  .setOpenTelemetry(openTelemetry)
+  .setEnableApiTracing(true)
+  .build();
+  ```
+    
+  This option can also be enabled by setting the environment variable
+  `SPANNER_ENABLE_API_TRACING=true`.
+
+  > Note: The attribute keys that are used for additional information about retry attempts and the number of requests might change in a future release.
 
   ## Migrate from OpenCensus to OpenTelemetry
 

README.md

@@ -57,13 +57,13 @@ implementation 'com.google.cloud:google-cloud-spanner'
 If you are using Gradle without BOM, add this to your dependencies:
 
 ```Groovy
-implementation 'com.google.cloud:google-cloud-spanner:6.70.0'
+implementation 'com.google.cloud:google-cloud-spanner:6.71.0'
 ```
 
 If you are using SBT, add this to your dependencies:
 
 ```Scala
-libraryDependencies += "com.google.cloud" % "google-cloud-spanner" % "6.70.0"
+libraryDependencies += "com.google.cloud" % "google-cloud-spanner" % "6.71.0"
 ```
 <!-- {x-version-update-end} -->
 
@@ -289,6 +289,7 @@ This option can also be enabled by setting the environment variable
 
 > Note: The attribute keys that are used for additional information about retry attempts and the number of requests might change in a future release.
 
+
 ### Instrument with OpenCensus
 
 > Note: OpenCensus project is deprecated. See [Sunsetting OpenCensus](https://opentelemetry.io/blog/2023/sunsetting-opencensus/).
@@ -422,6 +423,38 @@ SpannerOptions options = SpannerOptions.newBuilder()
 Spanner spanner = options.getService();
 ```
 
+#### OpenTelemetry SQL Statement Tracing
+The OpenTelemetry traces that are generated by the Java client include any request and transaction
+tags that have been set. The traces can also include the SQL statements that are executed and the
+name of the thread that executes the statement. Enable this with the `enableExtendedTracing`
+option:
+
+```
+SpannerOptions options = SpannerOptions.newBuilder()
+  .setOpenTelemetry(openTelemetry)
+  .setEnableExtendedTracing(true)
+  .build();
+```
+
+This option can also be enabled by setting the environment variable
+`SPANNER_ENABLE_EXTENDED_TRACING=true`.
+
+#### OpenTelemetry API Tracing
+You can enable tracing of each API call that the Spanner client executes with the `enableApiTracing`
+option. These traces also include any retry attempts for an API call:
+  
+```
+SpannerOptions options = SpannerOptions.newBuilder()
+.setOpenTelemetry(openTelemetry)
+.setEnableApiTracing(true)
+.build();
+```
+  
+This option can also be enabled by setting the environment variable
+`SPANNER_ENABLE_API_TRACING=true`.
+
+> Note: The attribute keys that are used for additional information about retry attempts and the number of requests might change in a future release.
+
 ## Migrate from OpenCensus to OpenTelemetry
 
 > Using the [OpenTelemetry OpenCensus Bridge](https://mvnrepository.com/artifact/io.opentelemetry/opentelemetry-opencensus-shim), you can immediately begin exporting your metrics and traces with OpenTelemetry
@@ -688,7 +721,7 @@ Java is a registered trademark of Oracle and/or its affiliates.
 [kokoro-badge-link-5]: http://storage.googleapis.com/cloud-devrel-public/java/badges/java-spanner/java11.html
 [stability-image]: https://img.shields.io/badge/stability-stable-green
 [maven-version-image]: https://img.shields.io/maven-central/v/com.google.cloud/google-cloud-spanner.svg
-[maven-version-link]: https://central.sonatype.com/artifact/com.google.cloud/google-cloud-spanner/6.70.0
+[maven-version-link]: https://central.sonatype.com/artifact/com.google.cloud/google-cloud-spanner/6.71.0
 [authentication]: https://github.com/googleapis/google-cloud-java#authentication
 [auth-scopes]: https://developers.google.com/identity/protocols/oauth2/scopes
 [predefined-iam-roles]: https://cloud.google.com/iam/docs/understanding-roles#predefined_roles