From cd66e203bd8e00d6cfa2e70b143562af27f2159f Mon Sep 17 00:00:00 2001
From: Thibault Cohen <titilambert@gmail.com>
Date: Sun, 6 Mar 2016 01:42:14 -0500
Subject: [PATCH] Improve procstat

closes #799
---
 CHANGELOG.md                              |  1 +
 plugins/inputs/procstat/README.md         |  4 ++++
 plugins/inputs/procstat/spec_processor.go | 10 ++++++++++
 3 files changed, 15 insertions(+)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2640d3f21..8632e7cb6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -12,6 +12,7 @@
 - [#788](https://github.com/influxdata/telegraf/pull/788): -input-list and -output-list command-line options. Thanks @ebookbug!
 - [#778](https://github.com/influxdata/telegraf/pull/778): Adding a TCP input listener.
 - [#797](https://github.com/influxdata/telegraf/issues/797): Provide option for persistent MQTT consumer client sessions.
+- [#799](https://github.com/influxdata/telegraf/pull/799): Add number of threads for procstat input plugin. Thanks @titilambert!
 
 ### Bugfixes
 - [#748](https://github.com/influxdata/telegraf/issues/748): Fix sensor plugin split on ":"
diff --git a/plugins/inputs/procstat/README.md b/plugins/inputs/procstat/README.md
index 90552c2a6..ef96500a3 100644
--- a/plugins/inputs/procstat/README.md
+++ b/plugins/inputs/procstat/README.md
@@ -35,6 +35,10 @@ The above configuration would result in output like:
 # Measurements
 Note: prefix can be set by the user, per process.
 
+
+Threads related measurement names:
+- procstat_[prefix_]num_threads value=5
+
 File descriptor related measurement names:
 - procstat_[prefix_]num_fds value=4
 
diff --git a/plugins/inputs/procstat/spec_processor.go b/plugins/inputs/procstat/spec_processor.go
index b09ed4f21..bb248f003 100644
--- a/plugins/inputs/procstat/spec_processor.go
+++ b/plugins/inputs/procstat/spec_processor.go
@@ -52,6 +52,7 @@ func NewSpecProcessor(
 }
 
 func (p *SpecProcessor) pushMetrics() {
+	p.pushNThreadsStats()
 	p.pushFDStats()
 	p.pushCtxStats()
 	p.pushIOStats()
@@ -60,6 +61,15 @@ func (p *SpecProcessor) pushMetrics() {
 	p.flush()
 }
 
+func (p *SpecProcessor) pushNThreadsStats() error {
+	numThreads, err := p.proc.NumThreads()
+	if err != nil {
+		return fmt.Errorf("NumThreads error: %s\n", err)
+	}
+	p.add("num_threads", numThreads)
+	return nil
+}
+
 func (p *SpecProcessor) pushFDStats() error {
 	fds, err := p.proc.NumFDs()
 	if err != nil {