Add node type tag to mongodb input (#6731)

plugins/inputs/mongodb/README.md

@@ -55,6 +55,7 @@ by running Telegraf with the `--debug` argument.
 - mongodb
   - tags:
     - hostname
+    - node_type
   - fields:
     - active_reads (integer)
     - active_writes (integer)
@@ -184,7 +185,7 @@ by running Telegraf with the `--debug` argument.
 
 ### Example Output:
 ```
-mongodb,hostname=127.0.0.1:27017 active_reads=0i,active_writes=0i,commands=1335i,commands_per_sec=7i,connections_available=814i,connections_current=5i,connections_total_created=0i,cursor_no_timeout=0i,cursor_no_timeout_count=0i,cursor_pinned=0i,cursor_pinned_count=1i,cursor_timed_out=0i,cursor_timed_out_count=0i,cursor_total=0i,cursor_total_count=1i,deletes=0i,deletes_per_sec=0i,document_deleted=0i,document_inserted=0i,document_returned=13i,document_updated=0i,flushes=5i,flushes_per_sec=0i,getmores=269i,getmores_per_sec=0i,inserts=0i,inserts_per_sec=0i,jumbo_chunks=0i,member_status="PRI",net_in_bytes=986i,net_in_bytes_count=358006i,net_out_bytes=23906i,net_out_bytes_count=661507i,open_connections=5i,percent_cache_dirty=0,percent_cache_used=0,queries=18i,queries_per_sec=3i,queued_reads=0i,queued_writes=0i,repl_commands=0i,repl_commands_per_sec=0i,repl_deletes=0i,repl_deletes_per_sec=0i,repl_getmores=0i,repl_getmores_per_sec=0i,repl_inserts=0i,repl_inserts_per_sec=0i,repl_lag=0i,repl_oplog_window_sec=24355215i,repl_queries=0i,repl_queries_per_sec=0i,repl_updates=0i,repl_updates_per_sec=0i,resident_megabytes=62i,state="PRIMARY",total_available=0i,total_created=0i,total_in_use=0i,total_refreshing=0i,ttl_deletes=0i,ttl_deletes_per_sec=0i,ttl_passes=23i,ttl_passes_per_sec=0i,updates=0i,updates_per_sec=0i,vsize_megabytes=713i,wtcache_app_threads_page_read_count=13i,wtcache_app_threads_page_read_time=74i,wtcache_app_threads_page_write_count=0i,wtcache_bytes_read_into=55271i,wtcache_bytes_written_from=125402i,wtcache_current_bytes=117050i,wtcache_max_bytes_configured=1073741824i,wtcache_pages_evicted_by_app_thread=0i,wtcache_pages_queued_for_eviction=0i,wtcache_server_evicting_pages=0i,wtcache_tracked_dirty_bytes=0i,wtcache_worker_thread_evictingpages=0i 1547159491000000000
+mongodb,hostname=127.0.0.1:27017,node_type=PRI active_reads=0i,active_writes=0i,commands=1335i,commands_per_sec=7i,connections_available=814i,connections_current=5i,connections_total_created=0i,cursor_no_timeout=0i,cursor_no_timeout_count=0i,cursor_pinned=0i,cursor_pinned_count=1i,cursor_timed_out=0i,cursor_timed_out_count=0i,cursor_total=0i,cursor_total_count=1i,deletes=0i,deletes_per_sec=0i,document_deleted=0i,document_inserted=0i,document_returned=13i,document_updated=0i,flushes=5i,flushes_per_sec=0i,getmores=269i,getmores_per_sec=0i,inserts=0i,inserts_per_sec=0i,jumbo_chunks=0i,member_status="PRI",net_in_bytes=986i,net_in_bytes_count=358006i,net_out_bytes=23906i,net_out_bytes_count=661507i,open_connections=5i,percent_cache_dirty=0,percent_cache_used=0,queries=18i,queries_per_sec=3i,queued_reads=0i,queued_writes=0i,repl_commands=0i,repl_commands_per_sec=0i,repl_deletes=0i,repl_deletes_per_sec=0i,repl_getmores=0i,repl_getmores_per_sec=0i,repl_inserts=0i,repl_inserts_per_sec=0i,repl_lag=0i,repl_oplog_window_sec=24355215i,repl_queries=0i,repl_queries_per_sec=0i,repl_updates=0i,repl_updates_per_sec=0i,resident_megabytes=62i,state="PRIMARY",total_available=0i,total_created=0i,total_in_use=0i,total_refreshing=0i,ttl_deletes=0i,ttl_deletes_per_sec=0i,ttl_passes=23i,ttl_passes_per_sec=0i,updates=0i,updates_per_sec=0i,vsize_megabytes=713i,wtcache_app_threads_page_read_count=13i,wtcache_app_threads_page_read_time=74i,wtcache_app_threads_page_write_count=0i,wtcache_bytes_read_into=55271i,wtcache_bytes_written_from=125402i,wtcache_current_bytes=117050i,wtcache_max_bytes_configured=1073741824i,wtcache_pages_evicted_by_app_thread=0i,wtcache_pages_queued_for_eviction=0i,wtcache_server_evicting_pages=0i,wtcache_tracked_dirty_bytes=0i,wtcache_worker_thread_evictingpages=0i 1547159491000000000
 mongodb_db_stats,db_name=admin,hostname=127.0.0.1:27017 avg_obj_size=241,collections=2i,data_size=723i,index_size=49152i,indexes=3i,num_extents=0i,objects=3i,ok=1i,storage_size=53248i,type="db_stat" 1547159491000000000
 mongodb_db_stats,db_name=local,hostname=127.0.0.1:27017 avg_obj_size=813.9705882352941,collections=6i,data_size=55350i,index_size=102400i,indexes=5i,num_extents=0i,objects=68i,ok=1i,storage_size=204800i,type="db_stat" 1547159491000000000
 mongodb_col_stats,collection=foo,db_name=local,hostname=127.0.0.1:27017 size=375005928i,avg_obj_size=5494,type="col_stat",storage_size=249307136i,total_index_size=2138112i,ok=1i,count=68251i 1547159491000000000

plugins/inputs/mongodb/mongodb_data.go

@@ -229,6 +229,7 @@ func (d *MongodbData) AddDefaultStats() {
 	d.addStat(statLine, DefaultStats)
 	if d.StatLine.NodeType != "" {
 		d.addStat(statLine, DefaultReplStats)
+		d.Tags["node_type"] = d.StatLine.NodeType
 	}
 
 	if d.StatLine.OplogStats != nil {

plugins/inputs/mongodb/mongodb_data_test.go

@@ -190,6 +190,7 @@ func TestStateTag(t *testing.T) {
 	)
 
 	stateTags := make(map[string]string)
+	stateTags["node_type"] = "PRI"
 
 	var acc testutil.Accumulator