Enable honor_labels

We have to enable honor_labels to avoid label duplication

Change-Id: I3c310ba414c0dc032045ae2b8ca34fcde9629a5f
Related-Bug: PROD-19209
diff --git a/fluentd/meta/prometheus.yml b/fluentd/meta/prometheus.yml
index e3fbe17..ef438c1 100644
--- a/fluentd/meta/prometheus.yml
+++ b/fluentd/meta/prometheus.yml
@@ -20,5 +20,6 @@
             replacement: {{ grains['host'] }}
             source_labels: "__address__"
             target_label: "host"
+        honor_labels: true
   {%- endif %}
 {%- endif %}