telegraf/plugins/inputs/influxdb/README.md

influxdb plugin

The InfluxDB plugin will collect metrics on the given InfluxDB servers.

This plugin can also gather metrics from endpoints that expose InfluxDB-formatted endpoints. See below for more information.

Configuration:

# Read InfluxDB-formatted JSON metrics from one or more HTTP endpoints
[[inputs.influxdb]]
  ## Works with InfluxDB debug endpoints out of the box,
  ## but other services can use this format too.
  ## See the influxdb plugin's README for more details.

  ## Multiple URLs from which to read InfluxDB-formatted JSON
  urls = [
    "http://localhost:8086/debug/vars"
  ]

Measurements & Fields

• influxdb_database
• influxdb_httpd
• influxdb_measurement
• influxdb_memstats
• influxdb_shard
• influxdb_subscriber
• influxdb_tsm1_cache
• influxdb_tsm1_wal
• influxdb_write

InfluxDB-formatted endpoints

The influxdb plugin can collect InfluxDB-formatted data from JSON endpoints. Whether associated with an Influx database or not.

With a configuration of:

[[inputs.influxdb]]
  urls = [
    "http://127.0.0.1:8086/debug/vars",
    "http://192.168.2.1:8086/debug/vars"
  ]

And if 127.0.0.1 responds with this JSON:

{
  "k1": {
    "name": "fruit",
    "tags": {
      "kind": "apple"
    },
    "values": {
      "inventory": 371,
      "sold": 112
    }
  },
  "k2": {
    "name": "fruit",
    "tags": {
      "kind": "banana"
    },
    "values": {
      "inventory": 1000,
      "sold": 403
    }
  }
}

And if 192.168.2.1 responds like so:

{
  "k3": {
    "name": "transactions",
    "tags": {},
    "values": {
      "total": 100,
      "balance": 184.75
    }
  }
}

Then the collected metrics will be:

influxdb_fruit,url='http://127.0.0.1:8086/debug/vars',kind='apple' inventory=371.0,sold=112.0
influxdb_fruit,url='http://127.0.0.1:8086/debug/vars',kind='banana' inventory=1000.0,sold=403.0

influxdb_transactions,url='http://192.168.2.1:8086/debug/vars' total=100.0,balance=184.75

There are two important details to note about the collected metrics:

1. Even though the values in JSON are being displayed as integers, the metrics are reported as floats. JSON encoders usually don't print the fractional part for round floats. Because you cannot change the type of an existing field in InfluxDB, we assume all numbers are floats.

2. The top-level keys' names (in the example above, "k1", "k2", and "k3") are not considered when recording the metrics.