Multi instances in win_perf_counters (#2352)

CHANGELOG.md

@@ -82,6 +82,8 @@ be deprecated eventually.
 - [#2520](https://github.com/influxdata/telegraf/pull/2520): Update default value for Cloudwatch rate limit
 - [#2513](https://github.com/influxdata/telegraf/issues/2513): create /etc/telegraf/telegraf.d directory in tarball.
 - [#2541](https://github.com/influxdata/telegraf/issues/2541): Return error on unsupported serializer data format.
+- [#1827](https://github.com/influxdata/telegraf/issues/1827): Fix Windows Performance Counters multi instance identifier
+
 
 ## v1.2.1 [2017-02-01]
 

plugins/inputs/win_perf_counters/win_perf_counters.go

@@ -265,6 +265,11 @@ func (m *Win_PerfCounters) Gather(acc telegraf.Accumulator) error {
 					} else if metric.instance == s {
 						// Catch if we set it to total or some form of it
 						add = true
+					} else if strings.Contains(metric.instance, "#") && strings.HasPrefix(metric.instance, s) {
+						// If you are using a multiple instance identifier such as "w3wp#1"
+						// phd.dll returns only the first 2 characters of the identifier.
+						add = true
+						s = metric.instance
 					} else if metric.instance == "------" {
 						add = true
 					}