From 0b343171a724c78b47ff9bbb0092ec8eb03a4fdc Mon Sep 17 00:00:00 2001
From: Thomas Roehl <Thomas.Roehl@googlemail.com>
Date: Fri, 7 Oct 2022 18:50:28 +0200
Subject: [PATCH] Add hostname-specific tag only if not already part of tags

---
 internal/metricRouter/metricRouter.go | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/internal/metricRouter/metricRouter.go b/internal/metricRouter/metricRouter.go
index 2614ced..8acb345 100644
--- a/internal/metricRouter/metricRouter.go
+++ b/internal/metricRouter/metricRouter.go
@@ -281,7 +281,9 @@ func (r *metricRouter) Start() {
 	// Foward message received from collector channel
 	coll_forward := func(p lp.CCMetric) {
 		// receive from metric collector
-		p.AddTag(r.config.HostnameTagName, r.hostname)
+		if !p.HasTag(r.config.HostnameTagName) {
+			p.AddTag(r.config.HostnameTagName, r.hostname)
+		}
 		if r.config.IntervalStamp {
 			p.SetTime(r.timestamp)
 		}
@@ -310,7 +312,9 @@ func (r *metricRouter) Start() {
 	cache_forward := func(p lp.CCMetric) {
 		// receive from metric collector
 		if !r.dropMetric(p) {
-			p.AddTag(r.config.HostnameTagName, r.hostname)
+			if !p.HasTag(r.config.HostnameTagName) {
+				p.AddTag(r.config.HostnameTagName, r.hostname)
+			}
 			forward(p)
 		}
 	}