MongoDB plugin always shows 0 replication lag

[lassizci]

Bug report

Relevant telegraf.conf:

[[inputs.mongodb]]
  servers = ["127.0.0.1:27017"]

System info:

telegraf 1.0.0-beta2
mongodb 3.2.7

repl_lag seems to always output 0i even though there's replication lag on the secondaries. I've been monitoring this through mongodb cloud. I do get all the other metrics pretty much as expected.

[apinyarr]

+1

[im-vincent]

Use two configuration files

/usr/bin/telegraf -config-directory /etc/telegraf/telegraf.d

vi rs0-0.conf
[[inputs.mongodb]]
  servers = ["8.8.8.8:27017"]
#PRIMARY

vi rs0-1.conf
[[inputs.mongodb]]
  servers = ["8.8.8.8:27018"]
#SECONDARY

Modify the mongostat.go

-	"gopkg.in/mgo.v2/bson"

 type ReplSetMember struct {
-	Name       string               `bson:"name"`
-	State      int64                `bson:"state"`
-	OptimeDate *bson.MongoTimestamp `bson:"optimeDate"`
+	Name       string    `bson:"name"`
+	State      int64     `bson:"state"`
+	OptimeDate time.Time `bson:"optimeDate"`
 }

-		if me.OptimeDate != nil && master.OptimeDate != nil && me.State == 2 {
+		if me.State == 2 {
 			// MongoTimestamp type is int64 where the first 32bits are the unix timestamp
-			lag := int64(*master.OptimeDate>>32 - *me.OptimeDate>>32)
+			lag := master.OptimeDate.Unix() - me.OptimeDate.Unix()

From Source:

Telegraf manages dependencies via gdm, which gets installed via the Makefile if you don't have it already. You also must build with golang version 1.5+.

Install Go
Setup your GOPATH
Run go get github.com/influxdata/telegraf
Run cd $GOPATH/src/github.com/influxdata/telegraf
Run make

[sparrc]

@im-vincent could you submit a PR?

[im-vincent]

I have already submit a PR as https://github.com/im-vincent/telegraf/

[sparrc]

@im-vincent I haven't received a PR

[im-vincent]

PR #2125

Is that right?

[sparrc]

closed by #2125