Github user jvwing commented on a diff in the pull request:
    --- Diff: 
    @@ -0,0 +1,203 @@
    + * Licensed to the Apache Software Foundation (ASF) under one or more
    + * contributor license agreements.  See the NOTICE file distributed with
    + * this work for additional information regarding copyright ownership.
    + * The ASF licenses this file to You under the Apache License, Version 2.0
    + * (the "License"); you may not use this file except in compliance with
    + * the License.  You may obtain a copy of the License at
    + *
    + *
    + *
    + * Unless required by applicable law or agreed to in writing, software
    + * distributed under the License is distributed on an "AS IS" BASIS,
    + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    + * See the License for the specific language governing permissions and
    + * limitations under the License.
    + */
    +import com.amazonaws.ClientConfiguration;
    +import com.amazonaws.auth.AWSCredentials;
    +import com.amazonaws.auth.AWSCredentialsProvider;
    +import org.apache.nifi.annotation.behavior.InputRequirement;
    +import org.apache.nifi.annotation.behavior.InputRequirement.Requirement;
    +import org.apache.nifi.annotation.behavior.SupportsBatching;
    +import org.apache.nifi.annotation.documentation.CapabilityDescription;
    +import org.apache.nifi.annotation.documentation.Tags;
    +import org.apache.nifi.components.PropertyDescriptor;
    +import org.apache.nifi.components.ValidationContext;
    +import org.apache.nifi.components.ValidationResult;
    +import org.apache.nifi.components.Validator;
    +import org.apache.nifi.flowfile.FlowFile;
    +import org.apache.nifi.processor.ProcessContext;
    +import org.apache.nifi.processor.ProcessSession;
    +import org.apache.nifi.processor.Relationship;
    +import org.apache.nifi.processor.exception.ProcessException;
    +import org.apache.nifi.processor.util.StandardValidators;
    +import java.util.Arrays;
    +import java.util.Collections;
    +import java.util.Date;
    +import java.util.HashSet;
    +import java.util.List;
    +import java.util.Set;
    +@Tags({"amazon", "aws", "cloudwatch", "metrics", "put", "publish"})
    +@CapabilityDescription("Publishes metrics to Amazon CloudWatch")
    +public class PutCloudWatchMetric extends 
AbstractAWSCredentialsProviderProcessor<AmazonCloudWatchClient> {
    +    public static final Set<Relationship> relationships = 
    +            new HashSet<>(Arrays.asList(REL_SUCCESS, REL_FAILURE)));
    +    private static final Validator DOUBLE_VALIDATOR = new Validator() {
    +        @Override
    +        public ValidationResult validate(String subject, String input, 
ValidationContext context) {
    +            if (context.isExpressionLanguageSupported(subject) && 
context.isExpressionLanguagePresent(input)) {
    +                return (new 
 Language Present").valid(true).build();
    +            } else {
    +                String reason = null;
    +                try {
    +                    Double.parseDouble(input);
    +                } catch (NumberFormatException var6) {
    --- End diff --
    Any significance to `var6`?  How about `nfe` or just `e`?

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