telegraf/plugins/aggregators/basicstats/README.md

# BasicStats Aggregator Plugin

The BasicStats aggregator plugin give us count,diff,max,min,mean,non_negative_diff,sum,s2(variance), stdev for a set of values,
emitting the aggregate every `period` seconds.

### Configuration:

```toml
# Keep the aggregate basicstats of each metric passing through.
[[aggregators.basicstats]]
  ## The period on which to flush & clear the aggregator.
  period = "30s"
  ## If true, the original metric will be dropped by the
  ## aggregator and will not get sent to the output plugins.
  drop_original = false

  ## Configures which basic stats to push as fields
  # stats = ["count","diff","min","max","mean","non_negative_diff","stdev","s2","sum"]
```

- stats
    - If not specified, then `count`, `min`, `max`, `mean`, `stdev`, and `s2` are aggregated and pushed as fields.  `sum`, `diff` and `non_negative_diff` are not aggregated by default to maintain backwards compatibility.
    - If empty array, no stats are aggregated

### Measurements & Fields:

- measurement1
    - field1_count
    - field1_diff (difference)
    - field1_max
    - field1_min
    - field1_mean
    - field1_non_negative_diff (non-negative difference)
    - field1_sum
    - field1_s2 (variance)
    - field1_stdev (standard deviation)

### Tags:

No tags are applied by this aggregator.

### Example Output:

```
$ telegraf --config telegraf.conf --quiet
system,host=tars load1=1 1475583980000000000
system,host=tars load1=1 1475583990000000000
system,host=tars load1_count=2,load1_diff=0,load1_max=1,load1_min=1,load1_mean=1,load1_sum=2,load1_s2=0,load1_stdev=0 1475584010000000000
system,host=tars load1=1 1475584020000000000
system,host=tars load1=3 1475584030000000000
system,host=tars load1_count=2,load1_diff=2,load1_max=3,load1_min=1,load1_mean=2,load1_sum=4,load1_s2=2,load1_stdev=1.414162 1475584010000000000
```