Remove the obsolete HTTP_STATUS_TEXT semantic attribute. (#1679)

api/src/main/java/io/opentelemetry/trace/attributes/SemanticAttributes.java

@@ -78,8 +78,6 @@ public final class SemanticAttributes {
   public static final AttributeKey<String> HTTP_SCHEME = stringKey("http.scheme");
   /** HTTP response status code. E.g. 200 (integer) If and only if one was received/sent. */
   public static final AttributeKey<Long> HTTP_STATUS_CODE = longKey("http.status_code");
-  /** HTTP reason phrase. E.g. "OK" */
-  public static final AttributeKey<String> HTTP_STATUS_TEXT = stringKey("http.status_text");
   /** Kind of HTTP protocol used: "1.0", "1.1", "2", "SPDY" or "QUIC". */
   public static final AttributeKey<String> HTTP_FLAVOR = stringKey("http.flavor");
   /** Value of the HTTP "User-Agent" header sent by the client. */

exporters/zipkin/src/test/java/io/opentelemetry/exporters/zipkin/ZipkinSpanExporterTest.java

@@ -192,12 +192,7 @@ class ZipkinSpanExporterTest {
   void generateSpan_AlreadyHasHttpStatusInfo() {
     Attributes attributeMap =
         Attributes.of(
-            SemanticAttributes.HTTP_STATUS_CODE,
-            404L,
-            SemanticAttributes.HTTP_STATUS_TEXT,
-            "NOT FOUND",
-            stringKey("error"),
-            "A user provided error");
+            SemanticAttributes.HTTP_STATUS_CODE, 404L, stringKey("error"), "A user provided error");
     SpanData data =
         buildStandardSpan()
             .setAttributes(attributeMap)
@@ -211,7 +206,6 @@ class ZipkinSpanExporterTest {
                 .toBuilder()
                 .clearTags()
                 .putTag(SemanticAttributes.HTTP_STATUS_CODE.getKey(), "404")
-                .putTag(SemanticAttributes.HTTP_STATUS_TEXT.getKey(), "NOT FOUND")
                 .putTag("error", "A user provided error")
                 .build());
   }