Switch profile compression to zstd default (#9293)

Author: jbachorik

dd-trace-api/src/main/java/datadog/trace/api/config/ProfilingConfig.java

@@ -39,13 +39,6 @@ public final class ProfilingConfig {
    */
   @Deprecated
   public static final String PROFILING_UPLOAD_COMPRESSION = "profiling.upload.compression";
-  /**
-   * Default compression value. Supported values are: - "on": equivalent to "lz4", will later be
-   * "zstd" - "off": disables compression - "lz4": uses LZ4 compression (fast with moderate
-   * compression ratio) - "gzip": uses GZIP compression (higher compression ratio but slower) -
-   * "zstd": uses ZSTD compression (high compression ratio with reasonable performance)
-   */
-  public static final String PROFILING_DEBUG_UPLOAD_COMPRESSION_DEFAULT = "lz4";
 
   public static final String PROFILING_PROXY_HOST = "profiling.proxy.host";
   public static final String PROFILING_PROXY_PORT = "profiling.proxy.port";
@@ -204,15 +197,23 @@ public final class ProfilingConfig {
 
   public static final String PROFILING_DEBUG_DUMP_PATH = "profiling.debug.dump_path";
   public static final String PROFILING_DEBUG_JFR_DISABLED = "profiling.debug.jfr.disabled";
+  // spotless:off
   /**
-   * Configuration for profile upload compression. Supported values are: - "on": equivalent to "lz4"
-   * - "off": disables compression - "lz4": uses LZ4 compression (fast with moderate compression
-   * ratio) - "gzip": uses GZIP compression (higher compression ratio but slower) - "zstd": uses
-   * ZSTD compression (high compression ratio with reasonable performance)
+   * Configuration for profile upload compression.<br><br> Supported values are:
+   * <ul>
+   * <li><b>on</b>: equivalent to <b>zstd</b></li>
+   * <li><b>off</b>: disables compression</li>
+   * <li><b>lz4</b>: uses LZ4 compression (fast with moderate compression ratio)</li>
+   * <li><b>gzip</b>: uses GZIP compression (higher compression ratio but slower)</li>
+   * <li><b>zstd</b>: uses ZSTD compression (high compression ratio with reasonable performance)</li>
+   * </ul>
    */
+  // spotless:on
   public static final String PROFILING_DEBUG_UPLOAD_COMPRESSION =
       "profiling.debug.upload.compression";
 
+  public static final String PROFILING_DEBUG_UPLOAD_COMPRESSION_DEFAULT = "zstd";
+
   public static final String PROFILING_CONTEXT_ATTRIBUTES = "profiling.context.attributes";
 
   public static final String PROFILING_CONTEXT_ATTRIBUTES_SPAN_NAME_ENABLED =