telegraf/plugins/inputs/httpjson/README.md

# HTTP JSON Plugin

The httpjson plugin can collect data from remote URLs which respond with JSON. Then it flattens JSON and finds all numeric values, treating them as floats.

For example, if you have a service called _mycollector_, which has HTTP endpoint for gathering stats at http://my.service.com/_stats, you would configure the HTTP JSON
plugin like this:

```
[[httpjson.services]]
  name = "mycollector"

  servers = [
    "http://my.service.com/_stats"
  ]

  # HTTP method to use (case-sensitive)
  method = "GET"
```

`name` is used as a prefix for the measurements.

`method` specifies HTTP method to use for requests.

You can also specify which keys from server response should be considered tags:

```
[[httpjson.services]]
  ...

  tag_keys = [
    "role",
    "version"
  ]
```

You can also specify additional request parameters for the service:

```
[[httpjson.services]]
  ...

 [httpjson.services.parameters]
    event_type = "cpu_spike"
    threshold = "0.75"

```


# Example:

Let's say that we have a service named "mycollector" configured like this:

```
[httpjson]
  [[httpjson.services]]
    name = "mycollector"

    servers = [
      "http://my.service.com/_stats"
    ]

    # HTTP method to use (case-sensitive)
    method = "GET"

    tag_keys = ["service"]
```

which responds with the following JSON:

```json
{
    "service": "service01",
    "a": 0.5,
    "b": {
        "c": "some text",
        "d": 0.1,
        "e": 5
    }
}
```

The collected metrics will be:
```
httpjson_mycollector_a,service='service01',server='http://my.service.com/_stats' value=0.5
httpjson_mycollector_b_d,service='service01',server='http://my.service.com/_stats' value=0.1
httpjson_mycollector_b_e,service='service01',server='http://my.service.com/_stats' value=5
```

# Example 2, Multiple Services:

There is also the option to collect JSON from multiple services, here is an
example doing that.

```
[httpjson]
  [[httpjson.services]]
    name = "mycollector1"

    servers = [
      "http://my.service1.com/_stats"
    ]

    # HTTP method to use (case-sensitive)
    method = "GET"

  [[httpjson.services]]
    name = "mycollector2"

    servers = [
      "http://service.net/json/stats"
    ]

    # HTTP method to use (case-sensitive)
    method = "POST"
```

The services respond with the following JSON:

mycollector1:
```json
{
    "a": 0.5,
    "b": {
        "c": "some text",
        "d": 0.1,
        "e": 5
    }
}
```

mycollector2:
```json
{
    "load": 100,
    "users": 1335
}
```

The collected metrics will be:

```
httpjson_mycollector1_a,server='http://my.service.com/_stats' value=0.5
httpjson_mycollector1_b_d,server='http://my.service.com/_stats' value=0.1
httpjson_mycollector1_b_e,server='http://my.service.com/_stats' value=5

httpjson_mycollector2_load,server='http://service.net/json/stats' value=100
httpjson_mycollector2_users,server='http://service.net/json/stats' value=1335
```