Add sqlserver input plugin

Godeps

@@ -47,6 +47,7 @@ github.com/stretchr/objx 1a9d0bb9f541897e62256577b352fdbc1fb4fd94
 github.com/stretchr/testify f390dcf405f7b83c997eac1b06768bb9f44dec18
 github.com/wvanbergen/kafka 1a8639a45164fcc245d5c7b4bd3ccfbd1a0ffbf3
 github.com/wvanbergen/kazoo-go 0f768712ae6f76454f987c3356177e138df258f8
+github.com/zensqlmonitor/go-mssqldb ffe5510c6fa5e15e6d983210ab501c815b56b363
 golang.org/x/crypto 3760e016850398b85094c4c99e955b8c3dea5711
 golang.org/x/net 72aa00c6241a8013dc9b040abb45f57edbe73945
 golang.org/x/text cf4986612c83df6c55578ba198316d1684a9a287

plugins/inputs/all/all.go

@@ -33,6 +33,7 @@ import (
 	_ "github.com/influxdata/telegraf/plugins/inputs/rethinkdb"
 	_ "github.com/influxdata/telegraf/plugins/inputs/sensors"
 	_ "github.com/influxdata/telegraf/plugins/inputs/snmp"
+	_ "github.com/influxdata/telegraf/plugins/inputs/sqlserver"
 	_ "github.com/influxdata/telegraf/plugins/inputs/statsd"
 	_ "github.com/influxdata/telegraf/plugins/inputs/system"
 	_ "github.com/influxdata/telegraf/plugins/inputs/trig"

plugins/inputs/sqlserver/README.md

@@ -0,0 +1,50 @@
+# SQL Server plugin
+
+This sqlserver plugin provides metrics for your SQL Server instance. 
+It currently works with SQL Server versions 2008+. 
+Recorded metrics are lightweight and use Dynamic Management Views supplied by SQL Server:
+```
+Performance counters  : 1000+ metrics from sys.dm_os_performance_counters
+Performance metrics   : special performance and ratio metrics
+Wait stats 			  : wait tasks categorized from sys.dm_os_wait_stats
+Memory clerk		  : memory breakdown from sys.dm_os_memory_clerks
+Database size         : databases size trend from sys.dm_io_virtual_file_stats
+Database IO			  : databases I/O from sys.dm_io_virtual_file_stats
+Database latency	  : databases latency from sys.dm_io_virtual_file_stats
+Database properties   : databases properties, state and recovery model, from sys.databases
+OS Volume             : available, used and total space from sys.dm_os_volume_stats
+CPU				      : cpu usage from sys.dm_os_ring_buffers
+```
+
+You must create a login on every instance you want to monitor, with following script:
+```SQL 
+USE master; 
+GO
+CREATE LOGIN [telegraf] WITH PASSWORD = N'mystrongpassword';
+GO
+GRANT VIEW SERVER STATE TO [telegraf]; 
+GO
+GRANT VIEW ANY DEFINITION TO [telegraf]; 
+GO
+```
+
+Overview
+![telegraf-sqlserver-0](https://cloud.githubusercontent.com/assets/16494280/12538189/ec1b70aa-c2d3-11e5-97ec-1a4f575e8a07.png)
+
+General Activity
+![telegraf-sqlserver-1](https://cloud.githubusercontent.com/assets/16494280/12591410/f098b602-c467-11e5-9acf-2edea077ed7e.png)
+
+Memory
+![telegraf-sqlserver-2](https://cloud.githubusercontent.com/assets/16494280/12591412/f2075688-c467-11e5-9d0f-d256e032cd0e.png)
+
+I/O
+![telegraf-sqlserver-3](https://cloud.githubusercontent.com/assets/16494280/12591417/f40ccb84-c467-11e5-89ff-498fb1bc3110.png)
+
+Disks
+![telegraf-sqlserver-4](https://cloud.githubusercontent.com/assets/16494280/12591420/f5de5f68-c467-11e5-90c8-9185444ac490.png)
+
+CPU
+![telegraf-sqlserver-5](https://cloud.githubusercontent.com/assets/16494280/12591446/11dfe7b8-c468-11e5-9681-6e33296e70e8.png)
+
+Full view
+![telegraf-sqlserver-full](https://cloud.githubusercontent.com/assets/16494280/12591426/fa2b17b4-c467-11e5-9c00-929f4c4aea57.png)