Add build properties file in its own namespace to carry project version info.

Author: akodali18

wavefront-spring-boot-bom/pom.xml

@@ -32,21 +32,30 @@
       <dependency>
         <groupId>com.wavefront</groupId>
         <artifactId>wavefront-opentracing-sdk-java</artifactId>
-        <version>2.0</version>
+        <version>2.1.1</version>
       </dependency>
       <dependency>
         <groupId>com.wavefront</groupId>
         <artifactId>wavefront-runtime-sdk-jvm</artifactId>
-        <version>1.1</version>
+        <version>1.3.1</version>
       </dependency>
       <dependency>
         <groupId>com.wavefront</groupId>
         <artifactId>wavefront-sdk-java</artifactId>
-        <version>2.5</version>
+        <version>2.6.2</version>
       </dependency>
     </dependencies>
   </dependencyManagement>
   <build>
+    <resources>
+      <resource>
+        <directory>src/main/resources</directory>
+      </resource>
+      <resource>
+        <directory>src/main/resources/</directory>
+        <filtering>true</filtering>
+      </resource>
+    </resources>
     <plugins>
       <plugin>
         <groupId>org.codehaus.mojo</groupId>

wavefront-spring-boot/src/main/java/com/wavefront/spring/autoconfigure/WavefrontSleuthSpanHandler.java

@@ -24,6 +24,7 @@
 import com.wavefront.java_sdk.com.google.common.collect.Sets;
 import com.wavefront.sdk.common.NamedThreadFactory;
 import com.wavefront.sdk.common.Pair;
+import com.wavefront.sdk.common.Utils;
 import com.wavefront.sdk.common.WavefrontSender;
 import com.wavefront.sdk.common.application.ApplicationTags;
 import com.wavefront.sdk.entities.tracing.SpanLog;
@@ -75,6 +76,7 @@ final class WavefrontSleuthSpanHandler extends SpanHandler implements Runnable,
 
   private final static String DEFAULT_SOURCE = "wavefront-spring-boot";
   private final static String WAVEFRONT_GENERATED_COMPONENT = "wavefront-generated";
+  public static final String SDK_METRIC_PREFIX = "~sdk.java.wavefront_spring_boot_starter.";
 
   final LinkedBlockingQueue<Pair<TraceContext, MutableSpan>> spanBuffer;
   final WavefrontSender wavefrontSender;
@@ -132,6 +134,8 @@ final class WavefrontSleuthSpanHandler extends SpanHandler implements Runnable,
     this.spanBuffer = new LinkedBlockingQueue<>(maxQueueSize);
 
     // init internal metrics
+    double sdkVersion = Utils.getSemVerGauge("wavefront-spring-boot");
+    meterRegistry.gauge(SDK_METRIC_PREFIX + "version", sdkVersion);
     meterRegistry.gauge("reporter.queue.size", spanBuffer, sb -> (double) sb.size());
     meterRegistry.gauge("reporter.queue.remaining_capacity", spanBuffer,
         sb -> (double) sb.remainingCapacity());

wavefront-spring-boot/src/main/resources/META-INF/wavefront-spring-boot/build.properties

@@ -0,0 +1 @@
+project.version=${project.version}