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# @elastic/apm-generator | ||
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`@elastic/apm-generator` is an experimental tool to generate synthetic APM data. It is intended to be used for development and testing of the Elastic APM app in Kibana. | ||
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At a high-level, the module works by modeling APM events/metricsets with [a fluent API](https://en.wikipedia.org/wiki/Fluent_interface). The models can then be serialized and converted to Elasticsearch documents. In the future we might support APM Server as an output as well. | ||
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## Usage | ||
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This section assumes that you've installed Kibana's dependencies by running `yarn kbn bootstrap` in the repository's root folder. | ||
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This library can currently be used in two ways: | ||
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- Imported as a Node.js module, for instance to be used in Kibana's functional test suite. | ||
- With a command line interface, to index data based on some example scenarios. | ||
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### Using the Node.js module | ||
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#### Concepts | ||
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- `Service`: a logical grouping for a monitored service. A `Service` object contains fields like `service.name`, `service.environment` and `agent.name`. | ||
- `Instance`: a single instance of a monitored service. E.g., the workload for a monitored service might be spread across multiple containers. An `Instance` object contains fields like `service.node.name` and `container.id`. | ||
- `Timerange`: an object that will return an array of timestamps based on an interval and a rate. These timestamps can be used to generate events/metricsets. | ||
- `Transaction`, `Span`, `APMError` and `Metricset`: events/metricsets that occur on an instance. For more background, see the [explanation of the APM data model](https://www.elastic.co/guide/en/apm/get-started/7.15/apm-data-model.html) | ||
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#### Example | ||
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```ts | ||
import { service, timerange, toElasticsearchOutput } from '@elastic/apm-generator'; | ||
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const instance = service('synth-go', 'production', 'go') | ||
.instance('instance-a'); | ||
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const from = new Date('2021-01-01T12:00:00.000Z').getTime(); | ||
const to = new Date('2021-01-01T12:00:00.000Z').getTime() - 1; | ||
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const traceEvents = timerange(from, to) | ||
.interval('1m') | ||
.rate(10) | ||
.flatMap(timestamp => instance.transaction('GET /api/product/list') | ||
.timestamp(timestamp) | ||
.duration(1000) | ||
.success() | ||
.children( | ||
instance.span('GET apm-*/_search', 'db', 'elasticsearch') | ||
.timestamp(timestamp + 50) | ||
.duration(900) | ||
.destination('elasticsearch') | ||
.success() | ||
).serialize() | ||
); | ||
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const metricsets = timerange(from, to) | ||
.interval('30s') | ||
.rate(1) | ||
.flatMap(timestamp => instance.appMetrics({ | ||
'system.memory.actual.free': 800, | ||
'system.memory.total': 1000, | ||
'system.cpu.total.norm.pct': 0.6, | ||
'system.process.cpu.total.norm.pct': 0.7, | ||
}).timestamp(timestamp) | ||
.serialize() | ||
); | ||
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const esEvents = toElasticsearchOutput(traceEvents.concat(metricsets)); | ||
``` | ||
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#### Generating metricsets | ||
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`@elastic/apm-generator` can also automatically generate transaction metrics, span destination metrics and transaction breakdown metrics based on the generated trace events. If we expand on the previous example: | ||
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```ts | ||
import { getTransactionMetrics, getSpanDestinationMetrics, getBreakdownMetrics } from '@elastic/apm-generator'; | ||
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const esEvents = toElasticsearchOutput([ | ||
...traceEvents, | ||
...getTransactionMetrics(traceEvents), | ||
...getSpanDestinationMetrics(traceEvents), | ||
...getBreakdownMetrics(traceEvents) | ||
]); | ||
``` | ||
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### CLI | ||
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Via the CLI, you can upload examples. The supported examples are listed in `src/lib/es.ts`. A `--target` option that specifies the Elasticsearch URL should be defined when running the `example` command. Here's an example: | ||
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`$ node packages/elastic-apm-generator/src/scripts/es.js example simple-trace --target=http://admin:changeme@localhost:9200` | ||
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The following options are supported: | ||
- `to`: the end of the time range, in ISO format. By default, the current time will be used. | ||
- `from`: the start of the time range, in ISO format. By default, `to` minus 15 minutes will be used. | ||
- `apm-server-version`: the version used in the index names bootstrapped by APM Server, e.g. `7.16.0`. __If these indices do not exist, the script will exit with an error. It will not bootstrap the indices itself.__ | ||
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