Adding upstream version 1.31.0.upstream/1.31.0

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

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+<!--
+title: "K6 load test monitoring with Netdata"
+custom_edit_url: https://github.com/netdata/netdata/edit/master/collectors/statsd.plugin/k6.md
+
+sidebar_label: "K6 Load Testing"
+-->
+
+# K6 Load Testing monitoring with Netdata
+
+Monitors the impact of load testing experiments performed with [K6](https://k6.io/).
+
+You can read more about the metrics that K6 sends in the [K6 documentation](https://k6.io/docs/using-k6/metrics/). 
+
+## Requirements
+
+-   When running the k6 experiment, specify a [StatsD output](https://k6.io/docs/results-visualization/statsd/).
+    -   Tip: K6 currently supports tags only with [datadog output](https://k6.io/docs/results-visualization/datadog/), which is in essence StatsD. Netdata can be used with both.
+
+## Metrics
+
+![image](https://user-images.githubusercontent.com/13405632/117691411-8a7baf00-b1c4-11eb-9d87-8e9e7214871f.png)
+
+
+### HTTP Requests
+ 
+Number of HTTP requests that K6 generates, per second.
+
+### Failed HTTP Requests
+
+Number of failed HTTP requests that K6 generates, per second.
+
+### Virtual Active Users
+Current number of active virtual users.
+
+### Iteration Duration
+
+The time it took K6 to complete one full iteration of the main function.
+
+### Dropped Iterations
+
+The number of iterations that could not be started either due to lack of Virtual Users or lack of time.
+
+### Data
+
+The amount of data received and sent.
+
+### TTP Requests total duration
+   
+The total duration it took for a round-trip of an HTTP request. It includes:
+- Blocked HTTP requests: time spent blocked before initiating the request
+- Connecting HTTP requests: time spent establishing TCP connection to the remote host
+- Sending HTTP requests: time spent sending data to the remote host
+- Receiving HTTP requests: time spent receiving data from the remote host
+- Waiting HTTP requests: time spent waiting for response from the remote host
+
+### HTTP duration metrics
+
+Different metrics on the HTTP request as defined by K6. The HTTP request duration is defined by K6 as: `HTTP sending request` + `HTTP receiving request` + `HTTP waiting request`. 
+
+Metrics:
+- Median
+- Average
+- Max
+- Min
+- 95th percentile
+- absolute (the value as it is, without any computation)
+
+## Configuration
+
+The collector is preconfigured and defined in `statsd.plugin/k6.conf`.
+
+Due to being a StatsD collector, you only need to define the configuration file and then send data to Netdata using the StatsD protocol.
+
+If Netdata is running on the same machine as K6, no further configuration is required. Otherwise, you will have to [point K6](https://k6.io/docs/results-visualization/statsd/) to your node and make sure that the K6 process can reach Netdata.
+
+The default namespace that is used in the configuration is `k6`. If you change it in K6, you will have to change it as well in the configuration file `k6.conf`.