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165 lines
7.0 KiB
Markdown
165 lines
7.0 KiB
Markdown
---
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sort: 4
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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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# Writer
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For exporting data, VictoriaMetrics Anomaly Detection (`vmanomaly`) primarily employs the [VmWriter](#vm-writer), which writes produces 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>
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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><code>class</code></td>
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<td><code>"writer.vm.VmWriter"</code></td>
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<td>Name of the class needed to enable writing to VictoriaMetrics or Prometheus. VmWriter is the default option, if not specified.</td>
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</tr>
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<tr>
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<td><code>datasource_url</code></td>
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<td><code>"http://localhost:8481/"</code></td>
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<td>Datasource URL address</td>
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</tr>
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<tr>
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<td><code>tenant_id</code></td>
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<td><code>"0:0"</code></td>
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<td>For VictoriaMetrics Cluster version only, tenants are identified by accountID or accountID:projectID. See VictoriaMetrics Cluster <a href="https://docs.victoriametrics.com/Cluster-VictoriaMetrics.html#multitenancy">multitenancy docs</a></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"><code>metric_format</code></td>
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<td><code>__name__: "vmanomaly_$VAR"</code></td>
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<td rowspan="4">Metrics to save the output (in metric names or labels). Must have <code>__name__</code> key. Must have a value with <code>$VAR</code> placeholder in it to distinguish between resulting metrics. Supported placeholders:
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<ul>
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<li><code>$VAR</code> -- Variables that model provides, all models provide the following set: {"anomaly_score", "y", "yhat", "yhat_lower", "yhat_upper"}. Description of standard output is <a href="/anomaly-detection/components/models.html#vmanomaly-output">here</a>. Depending on <a href="/anomaly-detection/components/models.html">model type</a> it can provide more metrics, like "trend", "seasonality" etc.</li>
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<li><code>$QUERY_KEY</code> -- E.g. "ingestion_rate".</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 <a href="#metrics-formatting">here</a>.
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</td>
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</tr>
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<tr><td><code>for: "$QUERY_KEY"</code></td></tr>
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<tr><td><code>run: "test_metric_format"</code></td></tr>
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<tr><td><code>config: "io_vm_single.yaml"</code></td></tr>
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<!-- End of additional rows -->
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<tr>
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<td><code>import_json_path</code></td>
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<td><code>"/api/v1/import"</code></td>
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<td>Optional, to override the default import path</td>
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</tr>
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<tr>
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<td><code>health_path</code></td>
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<td><code>"health"</code></td>
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<td>Absolute or relative URL address where to check the availability of the datasource. Optional, to override the default <code>"/health"</code> path.</td>
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</tr>
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<tr>
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<td><code>user</code></td>
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<td><code>"USERNAME"</code></td>
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<td>BasicAuth username</td>
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</tr>
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<tr>
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<td><code>password</code></td>
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<td><code>"PASSWORD"</code></td>
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<td>BasicAuth password</td>
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</tr>
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<tr>
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<td><code>timeout</code></td>
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<td><code>"5s"</code></td>
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<td>Timeout for the requests, passed as a string. Defaults to "5s"</td>
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</tr>
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<tr>
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<td><code>verify_tls</code></td>
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<td><code>"false"</code></td>
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<td>Allows disabling TLS verification of the remote certificate.</td>
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</tr>
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<tr>
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<td><code>bearer_token</code></td>
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<td><code>"token"</code></td>
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<td>Token is passed in the standard format with the header: "Authorization: bearer {token}"</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: "writer.vm.VmWriter"
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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: "$QUERY_KEY"
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run: "test_metric_format"
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config: "io_vm_single.yaml"
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import_json_path: "/api/v1/import"
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health_path: "health"
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user: "foo"
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password: "bar"
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```
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### Healthcheck metrics
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`VmWriter` exposes [several healthchecks metrics](./monitoring.html#writer-behaviour-metrics).
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### Metrics formatting
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There should be 2 mandatory parameters set in `metric_format` - `__name__` and `for`.
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```yaml
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__name__: PREFIX1_$VAR
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for: PREFIX2_$QUERY_KEY
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```
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* for `__name__` parameter it will name metrics returned by models as `PREFIX1_anomaly_score`, `PREFIX1_yhat_lower`, etc. Vmanomaly output metrics names described [here](/anomaly-detection/components/models.html#vmanomaly-output)
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* for `for` parameter will add labels `PREFIX2_query_name_1`, `PREFIX2_query_name_2`, etc. Query names are set as aliases in config `reader` section in [`queries`](anomaly-detection/components/reader.html#config-parameters) parameter.
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It is possible to specify other custom label names needed.
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For example:
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```yaml
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custom_label_1: label_name_1
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custom_label_2: label_name_2
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```
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Apart from specified labels, output metrics will return labels inherited from input metrics returned by [queries](/anomaly-detection/components/reader.html#config-parameters).
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For example if input data contains labels such as `cpu=1, device=eth0, instance=node-exporter:9100` all these labels will be present in vmanomaly output metrics.
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So if metric_format section was set up like this:
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```yaml
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metric_format:
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__name__: "PREFIX1_$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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```yaml
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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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