---
title: "Results output | Grafana k6 documentation"
description: "For basic tests, the top-level summary that k6 provides might be enough. For detailed analysis, you can stream all data your test outputs to an external source."
---

> For a curated documentation index, see [llms.txt](/llms.txt). For the complete documentation index, see [llms-full.txt](/llms-full.txt).

# Results output

As k6 generates load for your test, it also makes *metrics* that measure the performance of the system. Broadly, you can analyze metrics in two ways:

- As summary statistics, in an *end-of-test* summary report.
- In granular detail, with measurements for every data point across test (and timestamps)

You can customize almost every aspect of result output:

- Create custom metrics
- Configure new summary statistics and print them to any text format.
- Stream the results to one or multiple services of your choice (for example, InfluxDB or Prometheus).

## Metrics

**Documentation**: [Using metrics](/docs/k6/latest/using-k6/metrics/)

k6 comes with built-in metrics about the test load and the system response. Key metrics include:

- `http_req_duration`, the end-to-end time of all requests (that is, the total latency)
- `http_req_failed`, the total number of failed requests
- `iterations`, the total number of iterations

## End-of-test summary

**Documentation**: [End-of-test summary](/docs/k6/latest/results-output/end-of-test/)

By default, k6 prints summarized results to `stdout`.

When you run a test, k6 outputs a plain-text logo, your test progress, and some test details. After the test finishes, k6 prints the full details and summary statistics of the test metrics.

The end-of-test summary shows aggregated statistical values for your result metrics, including:

- Median and average values
- Minimum and maximum values
- p90, p95, and p99 values

You can configure the statistics to report with the [`--summary-trend-stats`](/docs/k6/latest/using-k6/k6-options/reference/#summary-trend-stats) option. For example, this command displays only median, p95, and p99.9 values.

sh ![Copy code to clipboard](/media/images/icons/icon-copy-small-2.svg) Copy

```sh
k6 run --iterations=100 --vus=10 \
--summary-trend-stats="med,p(95),p(99.9)" script.js
```

### Custom reports with `handleSummary()`

For completely customized end-of-summary reports, k6 provides the `handleSummary()` function.

At the end of the test, k6 automatically creates an object with all aggregated statistics. The `handleSummary()` function can process this object into a custom report in any text format: JSON, HTML, XML, and whatever else.

## Time series and external outputs

**Documentation**: [Real-time metrics](/docs/k6/latest/results-output/real-time/)

The condensed end-of-test summary provides a top-level view of the test. For deeper analysis, you need to look at granular time-series data, which has metrics and timestamps for every point of the test.

You can access time-series metrics in two ways:

- Write them to a JSON or CSV file.
- Stream them to an external service.

In both cases, you can use the `--out` flag and declare your export format as the flag argument. If you want to send the metrics to multiple sources, you can use multiple flags with multiple arguments:

sh ![Copy code to clipboard](/media/images/icons/icon-copy-small-2.svg) Copy

```sh
k6 run \
--out json=test.json \
--out influxdb=http://localhost:8086/k6
```

The available built-in outputs include:

- [Amazon CloudWatch](/docs/k6/latest/results-output/real-time/amazon-cloudwatch/)
- [Cloud](/docs/k6/latest/results-output/real-time/cloud/)
- [CSV](/docs/k6/latest/results-output/real-time/csv/)
- [Datadog](/docs/k6/latest/results-output/real-time/datadog/)
- [Dynatrace](/docs/k6/latest/results-output/real-time/dynatrace/)
- [Elasticsearch](/docs/k6/latest/results-output/real-time/elasticsearch/)
- [Grafana Cloud Prometheus](/docs/k6/latest/results-output/real-time/grafana-cloud-prometheus/)
- [InfluxDB](/docs/k6/latest/results-output/real-time/influxdb/)
- [JSON](/docs/k6/latest/results-output/real-time/json/)
- [Netdata](/docs/k6/latest/results-output/real-time/netdata/)
- [New Relic](/docs/k6/latest/results-output/real-time/new-relic/)
- [Prometheus](/docs/k6/latest/results-output/real-time/prometheus-remote-write/)
- [TimescaleDB](/docs/k6/latest/results-output/real-time/timescaledb/)
- [StatsD](/docs/k6/latest/results-output/real-time/statsd/)