Add metrics to PublishDnsUpdatesAction

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=131190862

java/google/registry/dns/BUILD

@@ -38,6 +38,7 @@ java_library(
         "//java/google/registry/config",
         "//java/google/registry/dns/writer",
         "//java/google/registry/model",
+        "//java/google/registry/monitoring/metrics",
         "//java/google/registry/request",
         "//java/google/registry/util",
     ],

java/google/registry/dns/DnsMetrics.java

@@ -0,0 +1,68 @@
+// Copyright 2016 The Domain Registry Authors. All Rights Reserved.
+//
+// Licensed 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
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// 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.
+
+package google.registry.dns;
+
+import com.google.common.collect.ImmutableSet;
+import google.registry.monitoring.metrics.IncrementableMetric;
+import google.registry.monitoring.metrics.LabelDescriptor;
+import google.registry.monitoring.metrics.MetricRegistryImpl;
+
+/**
+ * DNS instrumentation.
+ */
+public class DnsMetrics {
+
+  private static final ImmutableSet<LabelDescriptor> LABEL_DESCRIPTORS =
+      ImmutableSet.of(
+          LabelDescriptor.create("tld", "TLD"),
+          LabelDescriptor.create(
+              "status", "Whether the publish request was accepted or rejected."));
+  private static final IncrementableMetric publishDomainRequests =
+      MetricRegistryImpl.getDefault()
+          .newIncrementableMetric(
+              "/dns/publish_domain_requests",
+              "count of publishDomain requests",
+              "count",
+              LABEL_DESCRIPTORS);
+  private static final IncrementableMetric publishHostRequests =
+      MetricRegistryImpl.getDefault()
+          .newIncrementableMetric(
+              "/dns/publish_host_requests",
+              "count of publishHost requests",
+              "count",
+              LABEL_DESCRIPTORS);
+
+  /**
+   * Increment a monotonic counter that tracks calls to {@link
+   * google.registry.dns.writer.DnsWriter#publishDomain(String)}, per TLD.
+   */
+  public void incrementPublishDomainRequests(String tld, Status status) {
+    publishDomainRequests.increment(tld, status.name());
+  }
+
+  /**
+   * Increment a monotonic counter that tracks calls to {@link
+   * google.registry.dns.writer.DnsWriter#publishHost(String)}, per TLD.
+   */
+  public void incrementPublishHostRequests(String tld, Status status) {
+    publishHostRequests.increment(tld, status.name());
+  }
+
+  /** Enum to encode the disposition of a publish request. */
+  public enum Status {
+    ACCEPTED,
+    REJECTED
+  }
+}

java/google/registry/dns/PublishDnsUpdatesAction.java

@@ -20,6 +20,7 @@ import static google.registry.util.CollectionUtils.nullToEmpty;
 
 import com.google.common.net.InternetDomainName;
 import google.registry.config.ConfigModule.Config;
+import google.registry.dns.DnsMetrics.Status;
 import google.registry.dns.writer.DnsWriter;
 import google.registry.request.Action;
 import google.registry.request.HttpException.ServiceUnavailableException;
@@ -44,6 +45,7 @@ public final class PublishDnsUpdatesAction implements Runnable, Callable<Void> {
 
   @Inject DnsQueue dnsQueue;
   @Inject DnsWriterProxy dnsWriterProxy;
+  @Inject DnsMetrics dnsMetrics;
   @Inject @Config("dnsWriteLockTimeout") Duration timeout;
   @Inject @Parameter(RequestParameters.PARAM_TLD) String tld;
   @Inject @Parameter(DOMAINS_PARAM) Set<String> domains;
@@ -76,16 +78,20 @@ public final class PublishDnsUpdatesAction implements Runnable, Callable<Void> {
       for (String domain : nullToEmpty(domains)) {
         if (!DomainNameUtils.isUnder(
             InternetDomainName.from(domain), InternetDomainName.from(tld))) {
+          dnsMetrics.incrementPublishDomainRequests(tld, Status.REJECTED);
           logger.severefmt("%s: skipping domain %s not under tld", tld, domain);
         } else {
+          dnsMetrics.incrementPublishDomainRequests(tld, Status.ACCEPTED);
           writer.publishDomain(domain);
         }
       }
       for (String host : nullToEmpty(hosts)) {
         if (!DomainNameUtils.isUnder(
             InternetDomainName.from(host), InternetDomainName.from(tld))) {
+          dnsMetrics.incrementPublishHostRequests(tld, Status.REJECTED);
           logger.severefmt("%s: skipping host %s not under tld", tld, host);
         } else {
+          dnsMetrics.incrementPublishHostRequests(tld, Status.ACCEPTED);
           writer.publishHost(host);
         }
       }

java/google/registry/module/backend/BackendComponent.java

@@ -47,6 +47,7 @@ import javax.inject.Singleton;
 @Component(
     modules = {
         AppIdentityCredentialModule.class,
+        BackendMetricsModule.class,
         BigqueryModule.class,
         ConfigModule.class,
         DatastoreServiceModule.class,

java/google/registry/module/backend/BackendMetricsModule.java

@@ -0,0 +1,34 @@
+// Copyright 2016 The Domain Registry Authors. All Rights Reserved.
+//
+// Licensed 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
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// 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.
+
+package google.registry.module.backend;
+
+import dagger.Module;
+import dagger.Provides;
+import google.registry.dns.DnsMetrics;
+import javax.inject.Singleton;
+
+/**
+ * Dagger module for injecting metrics. All metrics should have {@link Singleton} scope to avoid
+ * being recreated per-request, as the metrics generally track cumulative values.
+ */
+@Module
+public class BackendMetricsModule {
+
+  @Provides
+  @Singleton
+  static DnsMetrics provideDnsMetrics() {
+    return new DnsMetrics();
+  }
+}