Remove unused `getMetricsCollectorName` function

Remove `getMetricsCollectorName` from the `MetricsCollector` as it is
not used.

Change-Id: I1be871afcb9470326ca2f5ee808be9e865083237
diff --git a/src/main/java/com/googlesource/gerrit/plugins/gitrepometrics/collectors/FSMetricsCollector.java b/src/main/java/com/googlesource/gerrit/plugins/gitrepometrics/collectors/FSMetricsCollector.java
index bbbb7a4..cf71d5c 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/gitrepometrics/collectors/FSMetricsCollector.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/gitrepometrics/collectors/FSMetricsCollector.java
@@ -154,11 +154,6 @@
   }
 
   @Override
-  public String getMetricsCollectorName() {
-    return "filesystem-statistics";
-  }
-
-  @Override
   public ImmutableList<GitRepoMetric> availableMetrics() {
     return availableMetrics;
   }
diff --git a/src/main/java/com/googlesource/gerrit/plugins/gitrepometrics/collectors/GitRefsMetricsCollector.java b/src/main/java/com/googlesource/gerrit/plugins/gitrepometrics/collectors/GitRefsMetricsCollector.java
index ab3e529..1882dc2 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/gitrepometrics/collectors/GitRefsMetricsCollector.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/gitrepometrics/collectors/GitRefsMetricsCollector.java
@@ -85,11 +85,6 @@
   }
 
   @Override
-  public String getMetricsCollectorName() {
-    return "repo-ref-statistics";
-  }
-
-  @Override
   public ImmutableList<GitRepoMetric> availableMetrics() {
     return availableMetrics;
   }
diff --git a/src/main/java/com/googlesource/gerrit/plugins/gitrepometrics/collectors/GitStatsMetricsCollector.java b/src/main/java/com/googlesource/gerrit/plugins/gitrepometrics/collectors/GitStatsMetricsCollector.java
index 06b2c48..5f61c26 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/gitrepometrics/collectors/GitStatsMetricsCollector.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/gitrepometrics/collectors/GitStatsMetricsCollector.java
@@ -118,9 +118,4 @@
   public ImmutableList<GitRepoMetric> availableMetrics() {
     return availableMetrics;
   }
-
-  @Override
-  public String getMetricsCollectorName() {
-    return "git-statistics";
-  }
 }
diff --git a/src/main/java/com/googlesource/gerrit/plugins/gitrepometrics/collectors/MetricsCollector.java b/src/main/java/com/googlesource/gerrit/plugins/gitrepometrics/collectors/MetricsCollector.java
index dcff8e8..7d13ad8 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/gitrepometrics/collectors/MetricsCollector.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/gitrepometrics/collectors/MetricsCollector.java
@@ -35,13 +35,6 @@
       Consumer<HashMap<GitRepoMetric, Long>> populateMetrics);
 
   /**
-   * Returns the name of the metric collector.
-   *
-   * @return {@code String} with the metric collector name
-   */
-  String getMetricsCollectorName();
-
-  /**
    * Returns the list of available metrics provided by the collector.
    *
    * @return {@code ImmutableList<GitRepoMetric>} with the {@link GitRepoMetric} provided by the
diff --git a/src/test/java/com/googlesource/gerrit/plugins/gitrepometrics/FakeMetricsCollector.java b/src/test/java/com/googlesource/gerrit/plugins/gitrepometrics/FakeMetricsCollector.java
index 1a00761..705d7fe 100644
--- a/src/test/java/com/googlesource/gerrit/plugins/gitrepometrics/FakeMetricsCollector.java
+++ b/src/test/java/com/googlesource/gerrit/plugins/gitrepometrics/FakeMetricsCollector.java
@@ -24,7 +24,6 @@
 import org.eclipse.jgit.internal.storage.file.FileRepository;
 
 class FakeMetricsCollector implements MetricsCollector {
-  private final String prefix;
   private final GitRepoMetric fakeMetric1;
   private final GitRepoMetric fakeMetric2;
 
@@ -37,17 +36,11 @@
   }
 
   @Override
-  public String getMetricsCollectorName() {
-    return prefix + "-fake-metrics-collector";
-  }
-
-  @Override
   public ImmutableList<GitRepoMetric> availableMetrics() {
     return ImmutableList.of(fakeMetric1, fakeMetric2);
   }
 
   protected FakeMetricsCollector(String prefix) {
-    this.prefix = prefix;
     this.fakeMetric1 = new GitRepoMetric(prefix + "-fake-metric-1", "Fake metric 1", "Count");
     this.fakeMetric2 = new GitRepoMetric(prefix + "-fake-metric-2", "Fake metric 2", "Count");
   }