Fix NullAway issues

Author: shakuzen

micrometer-core/src/main/java/io/micrometer/core/instrument/DistributionSummary.java

@@ -244,7 +244,7 @@ public Builder publishPercentileHistogram(@Nullable Boolean enabled) {
          * then.
          */
         @Deprecated
-        public Builder sla(@Nullable long... sla) {
+        public Builder sla(long @Nullable ... sla) {
             return sla == null ? this : serviceLevelObjectives(Arrays.stream(sla).asDoubleStream().toArray());
         }
 
@@ -266,7 +266,7 @@ public Builder sla(@Nullable long... sla) {
          * then.
          */
         @Deprecated
-        public Builder sla(@Nullable double... sla) {
+        public Builder sla(double @Nullable ... sla) {
             this.distributionConfigBuilder.serviceLevelObjectives(sla);
             return this;
         }

micrometer-core/src/main/java/io/micrometer/core/instrument/Tags.java

@@ -322,7 +322,7 @@ public static Tags concat(@Nullable Iterable<? extends Tag> tags, @Nullable Iter
      * @param keyValues the additional key/value pairs to add, elements mustn't be null
      * @return the merged tags
      */
-    public static Tags concat(@Nullable Iterable<? extends Tag> tags, @Nullable String... keyValues) {
+    public static Tags concat(@Nullable Iterable<? extends Tag> tags, String @Nullable ... keyValues) {
         return Tags.of(tags).and(keyValues);
     }
 

micrometer-core/src/test/java/io/micrometer/core/instrument/TagsTest.java

@@ -147,7 +147,7 @@ void concatOnTwoTagsWithSameKeyAreMergedIntoOneTag() {
     @Test
     void concatWhenKeyValuesAreNullShouldReturnCurrentInstance() {
         Tags source = Tags.of("k", "v1");
-        Tags concatenated = Tags.concat(source, (String) null);
+        Tags concatenated = Tags.concat(source, (String[]) null);
         assertThat(source).isSameAs(concatenated);
     }