---
title: pagerduty.dedupKey() function
description: >
  `pagerduty.dedupKey()` uses the group key of an input table to generate and store a
  deduplication key in the `_pagerdutyDedupKey`column.
  The function sorts, newline-concatenates, SHA256-hashes, and hex-encodes the
  group key to create a unique deduplication key for each input table.
menu:
  flux_v0_ref:
    name: pagerduty.dedupKey
    parent: pagerduty
    identifier: pagerduty/dedupKey
weight: 101
---

<!------------------------------------------------------------------------------

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------------------------------------------------------------------------------->

`pagerduty.dedupKey()` uses the group key of an input table to generate and store a
deduplication key in the `_pagerdutyDedupKey`column.
The function sorts, newline-concatenates, SHA256-hashes, and hex-encodes the
group key to create a unique deduplication key for each input table.



##### Function type signature

```js
(<-tables: stream[A], ?exclude: [string]) => stream[{A with _pagerdutyDedupKey: string}]
```

{{% caption %}}
For more information, see [Function type signatures](/flux/v0/function-type-signatures/).
{{% /caption %}}

## Parameters

### exclude

Group key columns to exclude when generating the deduplication key.
Default is ["_start", "_stop", "_level"].



### tables

Input data. Default is piped-forward data (`<-`).




## Examples

### Add a PagerDuty deduplication key to output data

```js
import "pagerduty"
import "sampledata"

sampledata.int()
    |> pagerduty.dedupKey()

```

{{< expand-wrapper >}}
{{% expand "View example input and output" %}}

#### Input data

| _time                | _value  | *tag |
| -------------------- | ------- | ---- |
| 2021-01-01T00:00:00Z | -2      | t1   |
| 2021-01-01T00:00:10Z | 10      | t1   |
| 2021-01-01T00:00:20Z | 7       | t1   |
| 2021-01-01T00:00:30Z | 17      | t1   |
| 2021-01-01T00:00:40Z | 15      | t1   |
| 2021-01-01T00:00:50Z | 4       | t1   |

| _time                | _value  | *tag |
| -------------------- | ------- | ---- |
| 2021-01-01T00:00:00Z | 19      | t2   |
| 2021-01-01T00:00:10Z | 4       | t2   |
| 2021-01-01T00:00:20Z | -3      | t2   |
| 2021-01-01T00:00:30Z | 19      | t2   |
| 2021-01-01T00:00:40Z | 13      | t2   |
| 2021-01-01T00:00:50Z | 1       | t2   |


#### Output data

| _time                | _value  | *tag | _pagerdutyDedupKey                                               |
| -------------------- | ------- | ---- | ---------------------------------------------------------------- |
| 2021-01-01T00:00:00Z | -2      | t1   | 18fae60f7253ebb11c5cc79e69037f0320fec216b1be0c101a5575086a3ebd08 |
| 2021-01-01T00:00:10Z | 10      | t1   | 18fae60f7253ebb11c5cc79e69037f0320fec216b1be0c101a5575086a3ebd08 |
| 2021-01-01T00:00:20Z | 7       | t1   | 18fae60f7253ebb11c5cc79e69037f0320fec216b1be0c101a5575086a3ebd08 |
| 2021-01-01T00:00:30Z | 17      | t1   | 18fae60f7253ebb11c5cc79e69037f0320fec216b1be0c101a5575086a3ebd08 |
| 2021-01-01T00:00:40Z | 15      | t1   | 18fae60f7253ebb11c5cc79e69037f0320fec216b1be0c101a5575086a3ebd08 |
| 2021-01-01T00:00:50Z | 4       | t1   | 18fae60f7253ebb11c5cc79e69037f0320fec216b1be0c101a5575086a3ebd08 |

| _time                | _value  | *tag | _pagerdutyDedupKey                                               |
| -------------------- | ------- | ---- | ---------------------------------------------------------------- |
| 2021-01-01T00:00:00Z | 19      | t2   | e137b67e3ecac75539ab3f0c139e421433c389c7a9932a878aff5405712dc384 |
| 2021-01-01T00:00:10Z | 4       | t2   | e137b67e3ecac75539ab3f0c139e421433c389c7a9932a878aff5405712dc384 |
| 2021-01-01T00:00:20Z | -3      | t2   | e137b67e3ecac75539ab3f0c139e421433c389c7a9932a878aff5405712dc384 |
| 2021-01-01T00:00:30Z | 19      | t2   | e137b67e3ecac75539ab3f0c139e421433c389c7a9932a878aff5405712dc384 |
| 2021-01-01T00:00:40Z | 13      | t2   | e137b67e3ecac75539ab3f0c139e421433c389c7a9932a878aff5405712dc384 |
| 2021-01-01T00:00:50Z | 1       | t2   | e137b67e3ecac75539ab3f0c139e421433c389c7a9932a878aff5405712dc384 |

{{% /expand %}}
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