all: upgrade to OpenCensus v0.21.0

Adaptation of @dmichel1's PR
census-ecosystem#59

which upgraded to OpenCensus v0.21.0 so as to use a bug fix from v0.18.0
for high CPU usage for low QPS services.

This commit also takes into consideration new updates to v0.21.0
that require a TagMap TTL.

build.gradle

@@ -8,7 +8,7 @@ apply plugin: "net.ltgt.errorprone"
 apply plugin: "signing"
 
 group = "io.orijtech.integrations"
-version = "0.0.2" // CURRENT_OCJDBC_VERSION
+version = "0.0.4" // CURRENT_OCJDBC_VERSION
 
 sourceCompatibility = 1.8
 targetCompatibility = 1.8
@@ -38,7 +38,7 @@ buildscript {
     }
 }
 
-def opencensusVersion = '0.16.1'
+def opencensusVersion = '0.21.0'
 def errorProneVersion = '2.3.1'
 def findBugsJsr305Version = '3.0.2'
 

src/main/java/io/opencensus/integration/jdbc/Observability.java

@@ -27,6 +27,8 @@
 import io.opencensus.tags.TagContext;
 import io.opencensus.tags.TagContextBuilder;
 import io.opencensus.tags.TagKey;
+import io.opencensus.tags.TagMetadata;
+import io.opencensus.tags.TagMetadata.TagTtl;
 import io.opencensus.tags.TagValue;
 import io.opencensus.tags.Tagger;
 import io.opencensus.tags.Tags;
@@ -107,6 +109,8 @@ private Observability() {}
                   500000.0)));
 
   static final Aggregation COUNT = Aggregation.Count.create();
+  static final TagMetadata TAG_METADATA_TTL_UNLIMITED =
+      TagMetadata.create(TagTtl.UNLIMITED_PROPAGATION);
 
   static final View SQL_CLIENT_LATENCY_VIEW =
       View.create(
@@ -190,13 +194,15 @@ void end() {
         // Finally record the latency of the entire call,
         // as well as "status": "OK" for non-error calls.
         TagContextBuilder tagContextBuilder = tagger.currentBuilder();
-        tagContextBuilder.put(JAVA_SQL_METHOD, TagValue.create(this.method));
+        tagContextBuilder.put(
+            JAVA_SQL_METHOD, TagValue.create(this.method), TAG_METADATA_TTL_UNLIMITED);
 
         if (recordedError == null) {
-          tagContextBuilder.put(JAVA_SQL_STATUS, VALUE_OK);
+          tagContextBuilder.put(JAVA_SQL_STATUS, VALUE_OK, TAG_METADATA_TTL_UNLIMITED);
         } else {
-          tagContextBuilder.put(JAVA_SQL_ERROR, TagValue.create(recordedError));
-          tagContextBuilder.put(JAVA_SQL_STATUS, VALUE_ERROR);
+          tagContextBuilder.put(
+              JAVA_SQL_ERROR, TagValue.create(recordedError), TAG_METADATA_TTL_UNLIMITED);
+          tagContextBuilder.put(JAVA_SQL_STATUS, VALUE_ERROR, TAG_METADATA_TTL_UNLIMITED);
         }
 
         long totalTimeNs = System.nanoTime() - this.startTimeNs;