added telegraf processor that reduces the container_name

Author: janvda

telegraf/telegraf.conf

@@ -130,8 +130,21 @@
 #                            PROCESSOR PLUGINS                                #
 ###############################################################################
 
-# # Print all metrics that pass through this filter.
-# [[processors.printer]]
+[[processors.regex]]
+ # This is a solution for the issue : https://github.com/janvda/balena-node-red-mqtt-nginx-TIG-stack/issues/10
+ # So this processor will replace all container_name like "influxdb_643150_676670" into "influxdb"
+ 
+ # namepass lists all docker container measurements having tag container_name (see https://github.com/influxdata/telegraf/tree/master/plugins/inputs/docker)
+ namepass = ["docker_container_mem","docker_container_cpu", "docker_container_net","docker_container_blkio","docker_container_health","docker_container_status" ]
+
+  # Tag and field conversions defined in a separate sub-tables
+	# below processor will change a container name like "influxdb_643150_676670" into "influxdb"
+  [[processors.regex.tags]]
+    ## Tag to change
+    key = "container_name"
+    ## Regular expression to match on a tag value
+    pattern = "^(.*)_[0-9]{6}_[0-9]{6}$"
+    replacement = "${1}"
 
 
 ###############################################################################