Add: Telegraf CouchDB Plugin

CouchDB Plugin - Formatted Code

closes #652

Minor fix for CouchDB Plugin

Formatted code fix for CouchDB Plugin

CouchDB Plugin - Changed hosts to full urls

CouchDB Plugin - Formatted Code

CouchDB Plugin - Fatal commit from local fix

CouchDB Plugin - Updated test case

CHANGELOG.md

@@ -3,6 +3,7 @@
 ### Release Notes
 
 ### Features
+- [#652](https://github.com/influxdata/telegraf/pull/652): CouchDB Input Plugin
 
 ### Bugfixes
 

README.md

@@ -155,6 +155,7 @@ Currently implemented sources:
 * aerospike
 * apache
 * bcache
+* couchdb
 * disque
 * docker
 * elasticsearch

plugins/inputs/all/all.go

@@ -4,6 +4,7 @@ import (
 	_ "github.com/influxdata/telegraf/plugins/inputs/aerospike"
 	_ "github.com/influxdata/telegraf/plugins/inputs/apache"
 	_ "github.com/influxdata/telegraf/plugins/inputs/bcache"
+	_ "github.com/influxdata/telegraf/plugins/inputs/couchdb"
 	_ "github.com/influxdata/telegraf/plugins/inputs/disque"
 	_ "github.com/influxdata/telegraf/plugins/inputs/docker"
 	_ "github.com/influxdata/telegraf/plugins/inputs/elasticsearch"

plugins/inputs/couchdb/README.md

@@ -0,0 +1,255 @@
+# CouchDB Input Plugin
+---
+
+The CouchDB plugin gathers metrics of CouchDB using [_stats](http://docs.couchdb.org/en/1.6.1/api/server/common.html?highlight=stats#get--_stats) endpoint.
+
+### Configuration:
+
+```
+# Sample Config:
+[[inputs.couchdb]]
+  hosts = ["http://localhost:5984/_stats"]
+```
+
+### Measurements & Fields:
+
+Statistics specific to the internals of CouchDB:
+
+- couchdb_auth_cache_misses
+- couchdb_database_writes
+- couchdb_open_databases
+- couchdb_auth_cache_hits
+- couchdb_request_time
+- couchdb_database_reads
+- couchdb_open_os_files
+
+Statistics of HTTP requests by method:
+
+- httpd_request_methods_put
+- httpd_request_methods_get
+- httpd_request_methods_copy
+- httpd_request_methods_delete
+- httpd_request_methods_post
+- httpd_request_methods_head
+
+Statistics of HTTP requests by response code:
+
+- httpd_status_codes_200
+- httpd_status_codes_201
+- httpd_status_codes_202
+- httpd_status_codes_301
+- httpd_status_codes_304
+- httpd_status_codes_400
+- httpd_status_codes_401
+- httpd_status_codes_403
+- httpd_status_codes_404
+- httpd_status_codes_405
+- httpd_status_codes_409
+- httpd_status_codes_412
+- httpd_status_codes_500
+
+httpd statistics:
+
+- httpd_clients_requesting_changes
+- httpd_temporary_view_reads
+- httpd_requests
+- httpd_bulk_requests
+- httpd_view_reads
+
+### Tags:
+
+- server (url of the couchdb _stats endpoint)
+
+### Example output:
+
+```
+➜  telegraf git:(master) ✗ ./telegraf -config ./config.conf  -input-filter couchdb -test
+* Plugin: couchdb,
+ Collection 1
+> couchdb,server=http://localhost:5984/_stats couchdb_auth_cache_hits_current=0,
+couchdb_auth_cache_hits_max=0,
+couchdb_auth_cache_hits_mean=0,
+couchdb_auth_cache_hits_min=0,
+couchdb_auth_cache_hits_stddev=0,
+couchdb_auth_cache_hits_sum=0,
+couchdb_auth_cache_misses_current=0,
+couchdb_auth_cache_misses_max=0,
+couchdb_auth_cache_misses_mean=0,
+couchdb_auth_cache_misses_min=0,
+couchdb_auth_cache_misses_stddev=0,
+couchdb_auth_cache_misses_sum=0,
+couchdb_database_reads_current=0,
+couchdb_database_reads_max=0,
+couchdb_database_reads_mean=0,
+couchdb_database_reads_min=0,
+couchdb_database_reads_stddev=0,
+couchdb_database_reads_sum=0,
+couchdb_database_writes_current=1102,
+couchdb_database_writes_max=131,
+couchdb_database_writes_mean=0.116,
+couchdb_database_writes_min=0,
+couchdb_database_writes_stddev=3.536,
+couchdb_database_writes_sum=1102,
+couchdb_open_databases_current=1,
+couchdb_open_databases_max=1,
+couchdb_open_databases_mean=0,
+couchdb_open_databases_min=0,
+couchdb_open_databases_stddev=0.01,
+couchdb_open_databases_sum=1,
+couchdb_open_os_files_current=2,
+couchdb_open_os_files_max=2,
+couchdb_open_os_files_mean=0,
+couchdb_open_os_files_min=0,
+couchdb_open_os_files_stddev=0.02,
+couchdb_open_os_files_sum=2,
+couchdb_request_time_current=242.21,
+couchdb_request_time_max=102,
+couchdb_request_time_mean=5.767,
+couchdb_request_time_min=1,
+couchdb_request_time_stddev=17.369,
+couchdb_request_time_sum=242.21,
+httpd_bulk_requests_current=0,
+httpd_bulk_requests_max=0,
+httpd_bulk_requests_mean=0,
+httpd_bulk_requests_min=0,
+httpd_bulk_requests_stddev=0,
+httpd_bulk_requests_sum=0,
+httpd_clients_requesting_changes_current=0,
+httpd_clients_requesting_changes_max=0,
+httpd_clients_requesting_changes_mean=0,
+httpd_clients_requesting_changes_min=0,
+httpd_clients_requesting_changes_stddev=0,
+httpd_clients_requesting_changes_sum=0,
+httpd_request_methods_copy_current=0,
+httpd_request_methods_copy_max=0,
+httpd_request_methods_copy_mean=0,
+httpd_request_methods_copy_min=0,
+httpd_request_methods_copy_stddev=0,
+httpd_request_methods_copy_sum=0,
+httpd_request_methods_delete_current=0,
+httpd_request_methods_delete_max=0,
+httpd_request_methods_delete_mean=0,
+httpd_request_methods_delete_min=0,
+httpd_request_methods_delete_stddev=0,
+httpd_request_methods_delete_sum=0,
+httpd_request_methods_get_current=31,
+httpd_request_methods_get_max=1,
+httpd_request_methods_get_mean=0.003,
+httpd_request_methods_get_min=0,
+httpd_request_methods_get_stddev=0.057,
+httpd_request_methods_get_sum=31,
+httpd_request_methods_head_current=0,
+httpd_request_methods_head_max=0,
+httpd_request_methods_head_mean=0,
+httpd_request_methods_head_min=0,
+httpd_request_methods_head_stddev=0,
+httpd_request_methods_head_sum=0,
+httpd_request_methods_post_current=1102,
+httpd_request_methods_post_max=131,
+httpd_request_methods_post_mean=0.116,
+httpd_request_methods_post_min=0,
+httpd_request_methods_post_stddev=3.536,
+httpd_request_methods_post_sum=1102,
+httpd_request_methods_put_current=1,
+httpd_request_methods_put_max=1,
+httpd_request_methods_put_mean=0,
+httpd_request_methods_put_min=0,
+httpd_request_methods_put_stddev=0.01,
+httpd_request_methods_put_sum=1,
+httpd_requests_current=1133,
+httpd_requests_max=130,
+httpd_requests_mean=0.118,
+httpd_requests_min=0,
+httpd_requests_stddev=3.512,
+httpd_requests_sum=1133,
+httpd_status_codes_200_current=31,
+httpd_status_codes_200_max=1,
+httpd_status_codes_200_mean=0.003,
+httpd_status_codes_200_min=0,
+httpd_status_codes_200_stddev=0.057,
+httpd_status_codes_200_sum=31,
+httpd_status_codes_201_current=1103,
+httpd_status_codes_201_max=130,
+httpd_status_codes_201_mean=0.116,
+httpd_status_codes_201_min=0,
+httpd_status_codes_201_stddev=3.532,
+httpd_status_codes_201_sum=1103,
+httpd_status_codes_202_current=0,
+httpd_status_codes_202_max=0,
+httpd_status_codes_202_mean=0,
+httpd_status_codes_202_min=0,
+httpd_status_codes_202_stddev=0,
+httpd_status_codes_202_sum=0,
+httpd_status_codes_301_current=0,
+httpd_status_codes_301_max=0,
+httpd_status_codes_301_mean=0,
+httpd_status_codes_301_min=0,
+httpd_status_codes_301_stddev=0,
+httpd_status_codes_301_sum=0,
+httpd_status_codes_304_current=0,
+httpd_status_codes_304_max=0,
+httpd_status_codes_304_mean=0,
+httpd_status_codes_304_min=0,
+httpd_status_codes_304_stddev=0,
+httpd_status_codes_304_sum=0,
+httpd_status_codes_400_current=0,
+httpd_status_codes_400_max=0,
+httpd_status_codes_400_mean=0,
+httpd_status_codes_400_min=0,
+httpd_status_codes_400_stddev=0,
+httpd_status_codes_400_sum=0,
+httpd_status_codes_401_current=0,
+httpd_status_codes_401_max=0,
+httpd_status_codes_401_mean=0,
+httpd_status_codes_401_min=0,
+httpd_status_codes_401_stddev=0,
+httpd_status_codes_401_sum=0,
+httpd_status_codes_403_current=0,
+httpd_status_codes_403_max=0,
+httpd_status_codes_403_mean=0,
+httpd_status_codes_403_min=0,
+httpd_status_codes_403_stddev=0,
+httpd_status_codes_403_sum=0,
+httpd_status_codes_404_current=0,
+httpd_status_codes_404_max=0,
+httpd_status_codes_404_mean=0,
+httpd_status_codes_404_min=0,
+httpd_status_codes_404_stddev=0,
+httpd_status_codes_404_sum=0,
+httpd_status_codes_405_current=0,
+httpd_status_codes_405_max=0,
+httpd_status_codes_405_mean=0,
+httpd_status_codes_405_min=0,
+httpd_status_codes_405_stddev=0,
+httpd_status_codes_405_sum=0,
+httpd_status_codes_409_current=0,
+httpd_status_codes_409_max=0,
+httpd_status_codes_409_mean=0,
+httpd_status_codes_409_min=0,
+httpd_status_codes_409_stddev=0,
+httpd_status_codes_409_sum=0,
+httpd_status_codes_412_current=0,
+httpd_status_codes_412_max=0,
+httpd_status_codes_412_mean=0,
+httpd_status_codes_412_min=0,
+httpd_status_codes_412_stddev=0,
+httpd_status_codes_412_sum=0,
+httpd_status_codes_500_current=0,
+httpd_status_codes_500_max=0,
+httpd_status_codes_500_mean=0,
+httpd_status_codes_500_min=0,
+httpd_status_codes_500_stddev=0,
+httpd_status_codes_500_sum=0,
+httpd_temporary_view_reads_current=0,
+httpd_temporary_view_reads_max=0,
+httpd_temporary_view_reads_mean=0,
+httpd_temporary_view_reads_min=0,
+httpd_temporary_view_reads_stddev=0,
+httpd_temporary_view_reads_sum=0,
+httpd_view_reads_current=0,
+httpd_view_reads_max=0,
+httpd_view_reads_mean=0,
+httpd_view_reads_min=0,
+httpd_view_reads_stddev=0,
+httpd_view_reads_sum=0 1454692257621938169
+```