Fix errorprone [FloggerLogString] errors

To fix this use Flogger's formatting log methods.

Change-Id: I6a67bee47218201ccf14a0cb4bbc2fb354cefea2
diff --git a/src/main/java/com/googlesource/gerrit/plugins/gitrepometrics/GitRepoMetricsCache.java b/src/main/java/com/googlesource/gerrit/plugins/gitrepometrics/GitRepoMetricsCache.java
index ad71e7f..2a509cb 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/gitrepometrics/GitRepoMetricsCache.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/gitrepometrics/GitRepoMetricsCache.java
@@ -90,8 +90,7 @@
         (repoMetric, value) -> {
           String metricsName = getMetricName(repoMetric.getName(), projectName);
           logger.atFine().log(
-              String.format(
-                  "Collected %s for project %s: %d", repoMetric.getName(), projectName, value));
+              "Collected %s for project %s: %d", repoMetric.getName(), projectName, value);
           metrics.put(metricsName, value);
 
           if (!metricExists(metricsName)) {
diff --git a/src/main/java/com/googlesource/gerrit/plugins/gitrepometrics/GitRepoUpdateListener.java b/src/main/java/com/googlesource/gerrit/plugins/gitrepometrics/GitRepoUpdateListener.java
index 3ac4903..a13f3a6 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/gitrepometrics/GitRepoUpdateListener.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/gitrepometrics/GitRepoUpdateListener.java
@@ -48,9 +48,8 @@
     if (event instanceof RefUpdatedEvent || isReplicationDoneEvent(event)) {
       String projectName = ((ProjectEvent) event).getProjectNameKey().get();
       logger.atFine().log(
-          String.format(
-              "Got %s event from %s. Might need to collect metrics for project %s",
-              event.type, event.instanceId, projectName));
+          "Got %s event from %s. Might need to collect metrics for project %s",
+          event.type, event.instanceId, projectName);
 
       if (gitRepoMetricsCache.shouldCollectStats(projectName)) {
         UpdateGitMetricsTask updateGitMetricsTask = updateGitMetricsTaskFactory.create(projectName);
diff --git a/src/main/java/com/googlesource/gerrit/plugins/gitrepometrics/UpdateGitMetricsTask.java b/src/main/java/com/googlesource/gerrit/plugins/gitrepometrics/UpdateGitMetricsTask.java
index 191a5e7..838429e 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/gitrepometrics/UpdateGitMetricsTask.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/gitrepometrics/UpdateGitMetricsTask.java
@@ -69,9 +69,8 @@
                       metrics.forEach(
                           (repoMetric, value) -> {
                             logger.atFine().log(
-                                String.format(
-                                    "Collected %s for project %s: %d",
-                                    repoMetric.getName(), projectName, value));
+                                "Collected %s for project %s: %d",
+                                repoMetric.getName(), projectName, value);
                             newMetrics.put(repoMetric, value);
                           });
                       gitRepoMetricsCache.setMetrics(newMetrics, projectName);
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 d9f352f..f37c293 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
@@ -135,7 +135,7 @@
       return metricsRecord.toMap();
     } catch (IOException e) {
       logger.atSevere().withCause(e).log(
-          "Error reading from file system for project " + projectName);
+          "Error reading from file system for project %s", projectName);
     }
 
     return new MetricsRecord().toMap();