Possible bug fix for oid_key collision

closes #1044

CHANGELOG.md

@@ -37,6 +37,7 @@ based on _prefix_ in addition to globs. This means that a filter like
 - [#1013](https://github.com/influxdata/telegraf/pull/1013): Close dead riemann output connections. Thanks @echupriyanov!
 - [#1012](https://github.com/influxdata/telegraf/pull/1012): Set default tags in test accumulator.
 - [#1058](https://github.com/influxdata/telegraf/issues/1058): Fix possible leaky TCP connections in influxdb output.
+- [#1044](https://github.com/influxdata/telegraf/pull/1044): Fix SNMP OID possible collisions. Thanks @relip
 
 ## v0.12.1 [2016-04-14]
 

plugins/inputs/snmp/snmp.go

@@ -733,7 +733,11 @@ func (h *Host) HandleResponse(oids map[string]Data, result *gosnmp.SnmpPacket, a
 					break nextresult
 				}
 			}
-			if strings.HasPrefix(variable.Name, oid_key) {
+			// If variable.Name is the same as oid_key
+			// OR
+			// the result is SNMP table which "." comes right after oid_key.
+			// ex: oid_key: .1.3.6.1.2.1.2.2.1.16, variable.Name: .1.3.6.1.2.1.2.2.1.16.1
+			if variable.Name == oid_key || strings.HasPrefix(variable.Name, oid_key+".") {
 				switch variable.Type {
 				// handle Metrics
 				case gosnmp.Boolean, gosnmp.Integer, gosnmp.Counter32, gosnmp.Gauge32,