path: root/collectors/statsd.plugin/README.md

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title: "statsd.plugin"
description: "The Netdata Agent is a fully-featured statsd server that collects metrics from any custom application and visualizes them in real-time."
custom_edit_url: https://github.com/netdata/netdata/edit/master/collectors/statsd.plugin/README.md
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# statsd.plugin

StatsD is a system to collect data from any application. Applications send metrics to it, usually via non-blocking UDP communication, and StatsD servers collect these metrics, perform a few simple calculations on them and push them to backend time-series databases.

If you want to learn more about the StatsD protocol, we have written a [blog post](https://www.netdata.cloud/blog/introduction-to-statsd/) about it!

There is a [plethora of client libraries](https://github.com/etsy/statsd/wiki#client-implementations) for embedding statsd metrics to any application framework. This makes statsd quite popular for custom application metrics.

Netdata is a fully featured statsd server. It can collect statsd formatted metrics, visualize them on its dashboards and store them in it's database for long-term retention.

Netdata statsd is inside Netdata (an internal plugin, running inside the Netdata daemon), it is configured via `netdata.conf` and by-default listens on standard statsd port 8125. Netdata supports both tcp and udp packets at the same time. 

Since statsd is embedded in Netdata, it means you now have a statsd server embedded on all your servers. 

Netdata statsd is fast. It can collect more than **1.200.000 metrics per second** on modern hardware, more than **200Mbps of sustained statsd traffic**, using 1 CPU core. The implementation uses two threads: one thread collects metrics, another one updates the charts from the collected data.

## Metrics supported by Netdata

Netdata fully supports the statsd protocol. All statsd client libraries can be used with Netdata too.

-   **Gauges**

     The application sends `name:value|g`, where `value` is any **decimal/fractional** number, statsd reports the latest value collected and the number of times it was updated (events).

     The application may increment or decrement a previous value, by setting the first character of the value to `+` or `-` (so, the only way to set a gauge to an absolute negative value, is to first set it to zero). 

     [Sampling rate](#sampling-rates) is supported.

     When a gauge is not collected and the setting is not to show gaps on the charts (the default), the last value will be shown, until a data collection event changes it.

-   **Counters** and **Meters**

     The application sends `name:value|c`, `name:value|C` or `name:value|m`, where `value` is a positive or negative **integer** number of events occurred, statsd reports the **rate** and the number of times it was updated (events).

     `:value` can be omitted and statsd will assume it is `1`. `|c`, `|C` and `|m` can be omitted an statsd will assume it is `|m`. So, the application may send just `name` and statsd will parse it as `name:1|m`.

     - Counters use `|c` (etsy/statsd compatible) or `|C` (brubeck compatible)
     - Meters use `|m`

     [Sampling rate](#sampling-rates) is supported.

     When a counter or meter is not collected, Netdata **defaults** to showing a zero value, until a data collection event changes the value.
     
-   **Timers** and **Histograms**

     The application sends `name:value|ms` or `name:value|h`, where `value` is any **decimal/fractional** number, statsd reports **min**, **max**, **average**, **sum**, **95th percentile**, **median** and **standard deviation** and the total number of times it was updated (events).

     - Timers use `|ms`
     - Histograms use `|h`
  
     The only difference between the two, is the `units` of the charts, as timers report *miliseconds*.

     [Sampling rate](#sampling-rates) is supported.

     When a counter or meter is not collected, Netdata **defaults** to showing a zero value, until a data collection event changes the value.

-   **Sets**

      The application sends `name:value|s`, where `value` is anything (**number or text**, leading and trailing spaces are removed), statsd reports the number of unique values sent and the number of times it was updated (events).

     Sampling rate is **not** supported for Sets. `value` is always considered text.

     When a counter or meter is not collected, Netdata **defaults** to showing a zero value, until a data collection event changes the value.

#### Sampling Rates

The application may append `|@sampling_rate`, where `sampling_rate` is a number from `0.0` to `1.0` in order for StatD to extrapolate the value and predict the total for the entire period. If the application reports to StatsD a value for 1/10th of the time, it can append `|@0.1` to the metrics it sends to statsd.

#### Overlapping metrics

Netdata's StatsD server maintains different indexes for each of the types supported. This means the same metric `name` may exist under different types concurrently.

#### Multiple metrics per packet

Netdata accepts multiple metrics per packet if each is terminated with `\n`.

#### TCP packets

Netdata listens for both TCP and UDP packets. For TCP, is it important to always append `\n` on each metric, as Netdata will use the newline character to detect if a metric is split into multiple TCP packets. 

On disconnect, Netdata will process the entire buffer, even if it is not terminated with a `\n`.

#### UDP packets

When sending multiple packets over UDP, it is important not to exceed the network MTU, usually about 1500 packets.

Netdata will accept UDP packets up to 9000 bytes, but the underlying network will not exceed MTU. 

> You can read more about the network maxium transmission unit(MTU) in this cloudflare [article](https://www.cloudflare.com/en-gb/learning/network-layer/what-is-mtu/).

## Configuration

You can find the configuration at `/etc/netdata/netdata.conf`:

```
[statsd]
	# enabled = yes
	# decimal detail = 1000
	# update every (flushInterval) = 1
	# udp messages to process at once = 10
	# create private charts for metrics matching = *
	# max private charts allowed = 200
	# max private charts hard limit = 1000
	# private charts memory mode = save
	# private charts history = 3996
	# histograms and timers percentile (percentThreshold) = 95.00000
	# add dimension for number of events received = yes
	# gaps on gauges (deleteGauges) = no
	# gaps on counters (deleteCounters) = no
	# gaps on meters (deleteMeters) = no
	# gaps on sets (deleteSets) = no
	# gaps on histograms (deleteHistograms) = no
	# gaps on timers (deleteTimers) = no
	# listen backlog = 4096
	# default port = 8125
	# bind to = udp:localhost:8125 tcp:localhost:8125
```

### StatsD main config options

-   `enabled = yes|no`

     controls if StatsD will be enabled for this Netdata. The default is enabled.

-   `default port = 8125`

     controls the default port StatsD will use if no port is defined in the following setting.

-   `bind to = udp:localhost tcp:localhost`

     is a space separated list of IPs and ports to listen to. The format is `PROTOCOL:IP:PORT` - if `PORT` is omitted, the `default port` will be used. If `IP` is IPv6, it needs to be enclosed in `[]`. `IP` can also be `*` (to listen on all IPs) or even a hostname.

-   `update every (flushInterval) = 1` seconds, controls the frequency StatsD will push the collected metrics to Netdata charts.

-   `decimal detail = 1000` controls the number of fractional digits in gauges and histograms. Netdata collects metrics using signed 64 bit integers and their fractional detail is controlled using multipliers and divisors. This setting is used to multiply all collected values to convert them to integers and is also set as the divisors, so that the final data will be a floating point number with this fractional detail (1000 = X.0 - X.999, 10000 = X.0 - X.9999, etc).

The rest of the settings are discussed below.

## StatsD charts

Netdata can visualize StatsD collected metrics in 2 ways:

1.  Each metric gets its own **private chart**. This is the default and does not require any configuration. You can adjust the default parameters.

2.  **Synthetic charts** can be created, combining multiple metrics, independently of their metric types. For this type of charts, special configuration is required, to define the chart title, type, units, its dimensions, etc.

### Private metric charts

Private charts are controlled with `create private charts for metrics matching = *`. This setting accepts a space separated list of [simple patterns](/libnetdata/simple_pattern/README.md). Netdata will create private charts for all metrics **by default**

For example, to render charts for all `myapp.*` metrics, except `myapp.*.badmetric`, use:

```
create private charts for metrics matching = !myapp.*.badmetric myapp.*
```

You can specify Netdata StatsD to have a different `memory mode` than the rest of the Netdata Agent. You can read more about `memory mode` in the [documentation](/database/README.md).

The default behavior is to use the same settings as the rest of the Netdata Agent. If you wish to change them, edit the following settings:
- `private charts memory mode`
- `private charts history`

### Optimise private metric charts visualization and storage

If you have thousands of metrics, each with its own private chart, you may notice that your web browser becomes slow when you view the Netdata dashboard (this is a web browser issue we need to address at the Netdata UI). So, Netdata has a protection to stop creating charts when `max private charts allowed = 200` (soft limit) is reached.

The metrics above this soft limit are still processed by Netdata and will be available to be sent to backend time-series databases, up to `max private charts hard limit = 1000`. So, between 200 and 1000 charts, Netdata will still generate charts, but they will automatically be created with `memory mode = none` (Netdata will not maintain a database for them). These metrics will be sent to backend time series databases, if the backend configuration is set to `as collected`.

Metrics above the hard limit are still collected, but they can only be used in synthetic charts (once a metric is added to chart, it will be sent to backend servers too).

Example private charts (automatically generated without any configuration):

#### Counters

-   Scope: **count the events of something** (e.g. number of file downloads)
-   Format: `name:INTEGER|c` or `name:INTEGER|C` or `name|c`
-   StatsD increments the counter by the `INTEGER` number supplied (positive, or negative).

![image](https://cloud.githubusercontent.com/assets/2662304/26131553/4a26d19c-3aa3-11e7-94e8-c53b5ed6ebc3.png)

#### Gauges

-   Scope: **report the value of something** (e.g. cache memory used by the application server)
-   Format: `name:FLOAT|g`
-   StatsD remembers the last value supplied, and can increment or decrement the latest value if `FLOAT` begins with `+` or `-`.

![image](https://cloud.githubusercontent.com/assets/2662304/26131575/5d54e6f0-3aa3-11e7-9099-bc4440cd4592.png)

#### histograms

-   Scope: **statistics on a size of events** (e.g. statistics on the sizes of files downloaded)
-   Format: `name:FLOAT|h`
-   StatsD maintains a list of all the values supplied and provides statistics on them.

![image](https://cloud.githubusercontent.com/assets/2662304/26131587/704de72a-3aa3-11e7-9ea9-0d2bb778c150.png)

The same chart with `sum` unselected, to show the detail of the dimensions supported:
![image](https://cloud.githubusercontent.com/assets/2662304/26131598/8076443a-3aa3-11e7-9ffa-ea535aee9c9f.png)

#### Meters

This is identical to `counter`.

-   Scope: **count the events of something** (e.g. number of file downloads)
-   Format: `name:INTEGER|m` or `name|m` or just `name`
-   StatsD increments the counter by the `INTEGER` number supplied (positive, or negative).

![image](https://cloud.githubusercontent.com/assets/2662304/26131605/8fdf5a06-3aa3-11e7-963f-7ecf207d1dbc.png)

#### Sets

-   Scope: **count the unique occurrences of something** (e.g. unique filenames downloaded, or unique users that downloaded files)
-   Format: `name:TEXT|s`
-   StatsD maintains a unique index of all values supplied, and reports the unique entries in it.

![image](https://cloud.githubusercontent.com/assets/2662304/26131612/9eaa7b1a-3aa3-11e7-903b-d881e9a35be2.png)

#### Timers

-   Scope: **statistics on the duration of events** (e.g. statistics for the duration of file downloads)
-   Format: `name:FLOAT|ms`
-   StatsD maintains a list of all the values supplied and provides statistics on them.

![image](https://cloud.githubusercontent.com/assets/2662304/26131620/acbea6a4-3aa3-11e7-8bdd-4a8996847767.png)

The same chart with the `sum` unselected:
![image](https://cloud.githubusercontent.com/assets/2662304/26131629/bc34f2d2-3aa3-11e7-8a07-f2fc94ba4352.png)

### Synthetic StatsD charts

Use synthetic charts to create dedicated sections on the dashboard to render your StatsD charts. 

Synthetic charts are organized in

-   **application** aka section in Netdata Dashboard.
-   **charts for each application** aka family in Netdata Dashboard.
-   **StatsD metrics for each chart** /aka charts and context Netdata Dashboard.

> You can read more about how the Netdata Agent organizes information in the relevant [documentation](/web/README.md)

For each application you need to create a `.conf` file in `/etc/netdata/statsd.d`.

For example, if you want to monitor the application `myapp` using StatD and Netdata, create the file `/etc/netdata/statsd.d/myapp.conf`, with this content:

```
[app]
	name = myapp
	metrics = myapp.*
	private charts = no
	gaps when not collected = no
	memory mode = ram
	history = 60

[dictionary]
    m1 = metric1
    m2 = metric2

# replace 'mychart' with the chart id
# the chart will be named: myapp.mychart
[mychart]
	name = mychart
	title = my chart title
	family = my family
	context = chart.context
	units = tests/s
	priority = 91000
	type = area
	dimension = myapp.metric1 m1
	dimension = myapp.metric2 m2
```

Using the above configuration `myapp` should get its own section on the dashboard, having one chart with 2 dimensions.

`[app]` starts a new application definition. The supported settings in this section are:

-   `name` defines the name of the app.
-   `metrics` is a Netdata [simple pattern](/libnetdata/simple_pattern/README.md). This pattern should match all the possible StatsD metrics that will be participating in the application `myapp`.
-   `private charts = yes|no`, enables or disables private charts for the metrics matched.
-   `gaps when not collected = yes|no`, enables or disables gaps on the charts of the application in case that no metrics are collected.
-   `memory mode` sets the memory mode for all charts of the application. The default is the global default for Netdata (not the global default for StatsD private charts).
-   `history` sets the size of the round robin database for this application. The default is the global default for Netdata (not the global default for StatsD private charts). This is only relevant if you use `memory mode = save`. Read more on our guide: [longer metrics storage](https://learn.netdata.cloud/guides/longer-metrics-storage).

`[dictionary]` defines name-value associations. These are used to renaming metrics, when added to synthetic charts. Metric names are also defined at each `dimension` line. However, using the dictionary dimension names can be declared globally, for each app and is the only way to rename dimensions when using patterns. Of course the dictionary can be empty or missing.

Then, add any number of charts. Each chart should start with `[id]`. The chart will be called `app_name.id`.  `family` controls the submenu on the dashboard. `context` controls the alarm templates. `priority` controls the ordering of the charts on the dashboard. The rest of the settings are informational.

Add any number of metrics to a chart, using `dimension` lines. These lines accept 5 space separated parameters:

1.  the metric name, as it is collected (it has to be matched by the `metrics =` pattern of the app)
2.  the dimension name, as it should be shown on the chart
3.  an optional selector (type) of the value to shown (see below)
4.  an optional multiplier
5.  an optional divider
6.  optional flags, space separated and enclosed in quotes. All the external plugins `DIMENSION` flags can be used. Currently the only usable flag is `hidden`, to add the dimension, but not show it on the dashboard. This is usually needed to have the values available for percentage calculation, or use them in alarms.

So, the format is this:

```
dimension = [pattern] METRIC NAME TYPE MULTIPLIER DIVIDER OPTIONS
```

`pattern` is a keyword. When set, `METRIC` is expected to be a Netdata [simple pattern](/libnetdata/simple_pattern/README.md) that will be used to match all the StatsD metrics to be added to the chart. So, `pattern` automatically matches any number of StatsD metrics, all of which will be added as separate chart dimensions.

`TYPE`, `MULTIPLIER`, `DIVIDER` and `OPTIONS` are optional.

`TYPE` can be:

-   `events` to show the number of events received by StatsD for this metric
-   `last` to show the last value, as calculated at the flush interval of the metric (the default)

Then for histograms and timers the following types are also supported:

-   `min`, show the minimum value
-   `max`, show the maximum value
-   `sum`, show the sum of all values
-   `average` (same as `last`)
-   `percentile`, show the 95th percentile (or any other percentile, as configured at StatsD global config)
-   `median`, show the median of all values (i.e. sort all values and get the middle value)
-   `stddev`, show the standard deviation of the values

#### Example synthetic charts

StatsD metrics: `foo` and `bar`.

Contents of file `/etc/netdata/stats.d/foobar.conf`:

```
[app]
  name = foobarapp
  metrics = foo bar
  private charts = yes

[foobar_chart1]
  title = Hey, foo and bar together
  family = foobar_family
  context = foobarapp.foobars
  units = foobars
  type = area
  dimension = foo 'foo me' last 1 1
  dimension = bar 'bar me' last 1 1
```

Metrics sent to statsd: `foo:10|g` and `bar:20|g`.

Private charts:

![screenshot from 2017-08-03 23-28-19](https://user-images.githubusercontent.com/2662304/28942295-7c3a73a8-78a3-11e7-88e5-a9a006bb7465.png)

Synthetic chart:

![screenshot from 2017-08-03 23-29-14](https://user-images.githubusercontent.com/2662304/28942317-958a2c68-78a3-11e7-853f-32850141dd36.png)

#### Renaming StatsD metrics

You can define a dictionary to rename metrics sent by StatsD clients. This enables you to send response `"200"` and Netdata visualize it as `succesful connection`

The `[dictionary]` section accepts any number of `name = value` pairs.

Netdata uses this dictionary as follows:

1.  When a `dimension` has a non-empty `NAME`, that name is looked up at the dictionary.

2.  If the above lookup gives nothing, or the `dimension` has an empty `NAME`, the original StatsD metric name is looked up at the dictionary.

3.  If any of the above succeeds, Netdata uses the `value` of the dictionary, to set the name of the dimension. The dimensions will have as ID the original StatsD metric name, and as name, the dictionary value.

Use the dictionary in 2 ways:

1.  set `dimension = myapp.metric1 ''` and have at the dictionary `myapp.metric1 = metric1 name`
2.  set `dimension = myapp.metric1 'm1'` and have at the dictionary `m1 = metric1 name`

In both cases, the dimension will be added with ID `myapp.metric1` and will be named `metric1 name`. So, in alarms use either of the 2 as `${myapp.metric1}` or `${metric1 name}`.

> keep in mind that if you add multiple times the same StatsD metric to a chart, Netdata will append `TYPE` to the dimension ID, so `myapp.metric1` will be added as `myapp.metric1_last` or `myapp.metric1_events`, etc. If you add multiple times the same metric with the same `TYPE` to a chart, Netdata will also append an incremental counter to the dimension ID, i.e. `myapp.metric1_last1`, `myapp.metric1_last2`, etc.

#### Dimension patterns

Netdata allows adding multiple dimensions to a chart, by matching the StatsD metrics with a Netdata simple pattern.

Assume we have an API that provides StatsD metrics for each response code per method it supports, like these:

```
myapp.api.get.200
myapp.api.get.400
myapp.api.get.500
myapp.api.del.200
myapp.api.del.400
myapp.api.del.500
myapp.api.post.200
myapp.api.post.400
myapp.api.post.500
myapp.api.all.200
myapp.api.all.400
myapp.api.all.500
```

In order to add all the response codes of `myapp.api.get` to a chart, we simply make the following configuration:

```
[api_get_responses]
   ...
   dimension = pattern 'myapp.api.get.* '' last 1 1
```

The above will add dimension named `200`, `400` and `500`. Netdata extracts the wildcard part of the metric name - so the dimensions will be named with whatever the `*` matched. 

You can rename the dimensions with this:

```
[dictionary]
    get.200 = 200 ok
    get.400 = 400 bad request
    get.500 = 500 cannot connect to db
    
[api_get_responses]
   ...
   dimension = pattern 'myapp.api.get.* 'get.' last 1 1
```

Note that we added a `NAME` to the dimension line with `get.`. This is prefixed to the wildcarded part of the metric name, to compose the key for looking up the dictionary. So `500` became `get.500` which was looked up to the dictionary to find value `500 cannot connect to db`. This way we can have different dimension names, for each of the API methods (i.e. `get.500 = 500 cannot connect to db` while `post.500 = 500 cannot write to disk`).

To add all API methods to a chart, you can do this:

```
[ok_by_method]
   ...
   dimension = pattern 'myapp.api.*.200 '' last 1 1
```

The above will add `get`, `post`, `del` and `all` to the chart.

If `all` is not wanted (a `stacked` chart does not need the `all` dimension, since the sum of the dimensions provides the total), the line should be:

```
[ok_by_method]
   ...
   dimension = pattern '!myapp.api.all.* myapp.api.*.200 '' last 1 1
```

With the above, all methods except `all` will be added to the chart.

To automatically rename the methods, you can use this:

```
[dictionary]
    method.get = GET
    method.post = ADD
    method.del = DELETE
    
[ok_by_method]
   ...
   dimension = pattern '!myapp.api.all.* myapp.api.*.200 'method.' last 1 1
```

Using the above, the dimensions will be added as `GET`, `ADD` and `DELETE`.

## StatsD examples

### Python

It's really easy to instrument your python application with StatsD, for example using [jsocol/pystatsd](https://github.com/jsocol/pystatsd). 

```python
import statsd
c = statsd.StatsClient('localhost', 8125)
c.incr('foo') # Increment the 'foo' counter.
for i in range(100000000):
   c.incr('bar')
   c.incr('foo')
   if i % 3:
       c.decr('bar')
       c.timing('stats.timed', 320) # Record a 320ms 'stats.timed'.
```

You can find detailed documentation in their [documentation page](https://statsd.readthedocs.io/en/v3.3/).

### Javascript and Node.js

Using the client library by [sivy/node-statsd](https://github.com/sivy/node-statsd), you can easily embed StatsD into your Node.js project.

```javascript
  var StatsD = require('node-statsd'),
      client = new StatsD();

  // Timing: sends a timing command with the specified milliseconds
  client.timing('response_time', 42);

  // Increment: Increments a stat by a value (default is 1)
  client.increment('my_counter');

  // Decrement: Decrements a stat by a value (default is -1)
  client.decrement('my_counter');

  // Using the callback
  client.set(['foo', 'bar'], 42, function(error, bytes){
    //this only gets called once after all messages have been sent
    if(error){
      console.error('Oh noes! There was an error:', error);
    } else {
      console.log('Successfully sent', bytes, 'bytes');
    }
  });

  // Sampling, tags and callback are optional and could be used in any combination
  client.histogram('my_histogram', 42, 0.25); // 25% Sample Rate
  client.histogram('my_histogram', 42, ['tag']); // User-defined tag
  client.histogram('my_histogram', 42, next); // Callback
  client.histogram('my_histogram', 42, 0.25, ['tag']);
  client.histogram('my_histogram', 42, 0.25, next);
  client.histogram('my_histogram', 42, ['tag'], next);
  client.histogram('my_histogram', 42, 0.25, ['tag'], next);
```
### Other languages

You can also use StatsD with:
- Golang, thanks to [alexcesaro/statsd](https://github.com/alexcesaro/statsd)
- Ruby, thanks to [reinh/statsd](https://github.com/reinh/statsd)
- Java, thanks to [DataDog/java-docstatsd-client](https://github.com/DataDog/java-dogstatsd-client)


### Shell

Getting the proper support for a programming language is not always easy, but shell is always available on most UNIX systems. You can use shell and `nc` to easily instrument your systems and send metric data to Netdata StatsD. Here is how:

The command you need to run is:

```sh
echo "NAME:VALUE|TYPE" | nc -u --send-only localhost 8125
```

Where:

-   `NAME` is the metric name
-   `VALUE` is the value for that metric (**gauges** `|g`, **timers** `|ms` and **histograms** `|h` accept decimal/fractional numbers, **counters** `|c` and **meters** `|m` accept integers, **sets** `|s` accept anything)
-   `TYPE` is one of `g`, `ms`, `h`, `c`, `m`, `s` to select the metric type.

So, to set `metric1` as gauge to value `10`, use:

```sh
echo "metric1:10|g" | nc -u --send-only localhost 8125
```

To increment `metric2` by `10`, as a counter, use:

```sh
echo "metric2:10|c" | nc -u --send-only localhost 8125
```

You can send multiple metrics like this:

```sh
# send multiple metrics via UDP
printf "metric1:10|g\nmetric2:10|c\n" | nc -u --send-only localhost 8125
```

Remember, for UDP communication each packet should not exceed the MTU. So, if you plan to push too many metrics at once, prefer TCP communication:

```sh
# send multiple metrics via TCP
printf "metric1:10|g\nmetric2:10|c\n" | nc --send-only localhost 8125
```

You can also use this little function to take care of all the details:

```sh
#!/usr/bin/env bash

STATSD_HOST="localhost"
STATSD_PORT="8125"
statsd() {
	local udp="-u" all="${*}"

        # if the string length of all parameters given is above 1000, use TCP
        [ "${#all}" -gt 1000 ] && udp=

        while [ ! -z "${1}" ]
        do
          	printf "${1}\n"
                shift
        done | nc ${udp} --send-only ${STATSD_HOST} ${STATSD_PORT} || return 1

        return 0
}
```

You can use it like this:

```sh
# first, source it in your script
source statsd.sh

# then, at any point:
StatsD "metric1:10|g" "metric2:10|c" ...
```
The function is smart enough to call `nc` just once and pass all the metrics to it. It will also automatically switch to TCP if the metrics to send are above 1000 bytes.

If you have gotten thus far, make sure to check out our [Community Forums](https://community.netdata.cloud) to share your experience using Netdata with StatsD.

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