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### Describe Your Changes
* `sort` param is unused by the current website engine, and was present only for compatibility
with previous website engine. It is time to remove it as it makes no effect
* re-structure guides content into folders to simplify assets management
### Checklist
The following checks are **mandatory**:
- [ ] My change adheres [VictoriaMetrics contributing
guidelines](https://docs.victoriametrics.com/contributing/).
(cherry picked from commit 35d77a3bed)
280 lines
7.1 KiB
Markdown
280 lines
7.1 KiB
Markdown
---
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title: Writer
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weight: 4
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menu:
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docs:
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parent: "vmanomaly-components"
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weight: 4
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aliases:
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- /anomaly-detection/components/writer.html
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---
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For exporting data, VictoriaMetrics Anomaly Detection (`vmanomaly`) primarily employs the [VmWriter](#vm-writer), which writes produced anomaly scores **(preserving initial labelset and optionally applying additional ones)** back to VictoriaMetrics. This writer is tailored for smooth data export within the VictoriaMetrics ecosystem.
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Future updates will introduce additional export methods, offering users more flexibility in data handling and integration.
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## VM writer
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### Config parameters
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<table class="params">
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<thead>
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<tr>
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<th>Parameter</th>
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<th>Example</th>
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<th>Description</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td>
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`class`
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</td>
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<td>
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`writer.vm.VmWriter` or `vm` starting from [`v1.13.0`](../CHANGELOG.md#v1130)
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</td>
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<td>
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Name of the class needed to enable writing to VictoriaMetrics or Prometheus. VmWriter is the default option, if not specified.
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</td>
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</tr>
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<tr>
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<td>
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`datasource_url`
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</td>
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<td>
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`http://localhost:8481/`
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</td>
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<td>
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Datasource URL address
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</td>
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</tr>
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<tr>
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<td>
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`tenant_id`
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</td>
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<td>
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`0:0`
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</td>
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<td>
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For VictoriaMetrics Cluster version only, tenants are identified by accountID or accountID:projectID. See VictoriaMetrics Cluster [multitenancy docs](../../Cluster-VictoriaMetrics.md#multitenancy)
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</td>
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</tr>
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<!-- Additional rows for metric_format -->
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<tr>
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<td rowspan="4">
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`metric_format`
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</td>
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<td>
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`__name__: "vmanomaly_$VAR"`
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</td>
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<td rowspan="4">
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Metrics to save the output (in metric names or labels). Must have `__name__` key. Must have a value with `$VAR` placeholder in it to distinguish between resulting metrics. Supported placeholders:
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<ul>
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<li>
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`$VAR` -- Variables that model provides, all models provide the following set: {"anomaly_score", "y", "yhat", "yhat_lower", "yhat_upper"}. Description of standard output is [here](./models.md#vmanomaly-output). Depending on [model type](./models.md) it can provide more metrics, like "trend", "seasonality" etc.
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</li>
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<li>
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`$QUERY_KEY` -- E.g. "ingestion_rate".
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</li>
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</ul>
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Other keys are supposed to be configured by the user to help identify generated metrics, e.g., specific config file name etc.
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More details on metric formatting are [here](#metrics-formatting).
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</td>
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</tr>
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<tr>
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<td>
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`for: "$QUERY_KEY"`
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</td>
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</tr>
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<tr>
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<td>
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`run: "test_metric_format"`
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</td>
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</tr>
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<tr>
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<td>
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`config: "io_vm_single.yaml"`
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</td>
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</tr>
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<!-- End of additional rows -->
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<tr>
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<td>
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`import_json_path`
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</td>
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<td>
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`/api/v1/import`
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</td>
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<td>
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Optional, to override the default import path
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</td>
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</tr>
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<tr>
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<td>
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`health_path`
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</td>
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<td>
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`/health`
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</td>
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<td>
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Absolute or relative URL address where to check the availability of the datasource. Optional, to override the default `/health` path.
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</td>
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</tr>
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<tr>
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<td>
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`user`
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</td>
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<td>
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`USERNAME`
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</td>
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<td>
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BasicAuth username
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</td>
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</tr>
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<tr>
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<td>
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`password`
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</td>
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<td>
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`PASSWORD`
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</td>
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<td>
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BasicAuth password
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</td>
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</tr>
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<tr>
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<td>
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`timeout`
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</td>
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<td>
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`5s`
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</td>
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<td>
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Timeout for the requests, passed as a string
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</td>
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</tr>
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<tr>
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<td>
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`verify_tls`
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</td>
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<td>
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`false`
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</td>
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<td>
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Allows disabling TLS verification of the remote certificate.
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</td>
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</tr>
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<tr>
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<td>
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`bearer_token`
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</td>
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<td>
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`token`
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</td>
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<td>
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Token is passed in the standard format with the header: `Authorization: bearer {token}`
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</td>
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</tr>
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</tbody>
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</table>
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Config example:
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```yaml
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writer:
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class: "vm" # or "writer.vm.VmWriter" until v1.13.0
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datasource_url: "http://localhost:8428/"
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tenant_id: "0:0"
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metric_format:
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__name__: "vmanomaly_$VAR"
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for: "$QUERY_KEY"
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run: "test_metric_format"
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config: "io_vm_single.yaml"
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import_json_path: "/api/v1/import"
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health_path: "health"
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user: "foo"
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password: "bar"
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```
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### Healthcheck metrics
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`VmWriter` exposes [several healthchecks metrics](./monitoring.md#writer-behaviour-metrics).
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### Metrics formatting
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There should be 2 mandatory parameters set in `metric_format` - `__name__` and `for`.
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```yaml
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__name__: PREFIX1_$VAR
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for: PREFIX2_$QUERY_KEY
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```
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* for `__name__` parameter it will name metrics returned by models as `PREFIX1_anomaly_score`, `PREFIX1_yhat_lower`, etc. Vmanomaly output metrics names described [here](./models.md#vmanomaly-output)
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* for `for` parameter will add labels `PREFIX2_query_name_1`, `PREFIX2_query_name_2`, etc. Query names are set as aliases in config `reader` section in [`queries`](./reader.md#config-parameters) parameter.
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It is possible to specify other custom label names needed.
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For example:
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```yaml
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custom_label_1: label_name_1
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custom_label_2: label_name_2
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```
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Apart from specified labels, output metrics will return **labels inherited from input metrics returned by [queries](./reader.md#config-parameters)**.
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For example if input data contains labels such as `cpu=1, device=eth0, instance=node-exporter:9100` all these labels will be present in vmanomaly output metrics.
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So if metric_format section was set up like this:
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```yaml
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metric_format:
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__name__: "PREFIX1_$VAR"
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for: "PREFIX2_$QUERY_KEY"
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custom_label_1: label_name_1
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custom_label_2: label_name_2
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```
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It will return metrics that will look like:
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```promtextmetric
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{__name__="PREFIX1_anomaly_score", for="PREFIX2_query_name_1", custom_label_1="label_name_1", custom_label_2="label_name_2", cpu=1, device="eth0", instance="node-exporter:9100"}
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{__name__="PREFIX1_yhat_lower", for="PREFIX2_query_name_1", custom_label_1="label_name_1", custom_label_2="label_name_2", cpu=1, device="eth0", instance="node-exporter:9100"}
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{__name__="PREFIX1_anomaly_score", for="PREFIX2_query_name_2", custom_label_1="label_name_1", custom_label_2="label_name_2", cpu=1, device="eth0", instance="node-exporter:9100"}
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{__name__="PREFIX1_yhat_lower", for="PREFIX2_query_name_2", custom_label_1="label_name_1", custom_label_2="label_name_2", cpu=1, device="eth0", instance="node-exporter:9100"}
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```
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