# List metric reduction rules URL: https://docs.hanzo.ai/docs/openapi/o11y/listmetricreductionrules > Lists the org's metric volume-control (label reduction) rules, pageable and sortable by name, volume or recency. `GET /v1/o11y/metric_reduction_rules` > [O11y →](https://docs.hanzo.ai/docs/openapi/o11y) · [All API references →](https://docs.hanzo.ai/docs/openapi) · [Get started →](https://docs.hanzo.ai/docs/guides) | | | | ------------- | ----------------------------------------------------- | | **Address** | `https://api.hanzo.ai/v1/o11y/metric_reduction_rules` | | **Method** | `GET` | | **Operation** | `ListMetricReductionRules` | | **Auth** | `Authorization: Bearer $HANZO_API_KEY` | Lists the org's metric volume-control (label reduction) rules, pageable and sortable by name, volume or recency. ## Request 6 fields. | Field | In | Type | Required | Description | | ------------ | ----- | ------- | -------- | ----------------------------------------------------------------------------------- | | `orderBy` | query | string | — | OrderBy sorts the page: metric, ingested\_volume, reduced\_volume or last\_updated. | | `order` | query | string | — | Order is asc or desc. | | `search` | query | string | — | Search narrows the page to rules whose metric name contains it. | | `metricName` | query | string | — | MetricName narrows the page to one metric's rule. | | `offset` | query | integer | — | Offset is how many rules to skip, for paging. | | `limit` | query | integer | — | Limit caps how many rules come back, at most 1000. | ## Response | Status | Body | Meaning | | --------- | ----------------------------- | ----------------- | | `200` | o11y.O11yReductionRuleListOut | ok | | `202` | Approval | held for approval | | `default` | problem-details | refused | `200` body — 18 fields. | Field | In | Type | Always | Description | | ------------------------------ | ---- | ------------------------- | ------ | ---------------------------------------------------------------------- | | `data` | body | o11y.O11yReductionRules | — | | | `data.rules` | body | o11y.O11yReductionRule\[] | — | Rules are the rules. | | `data.rules[].active` | body | boolean | — | Active says whether the rule is in force. | | `data.rules[].createdAt` | body | string (date-time) | — | CreatedAt is when the rule was created. | | `data.rules[].createdBy` | body | string | — | CreatedBy is who created it. | | `data.rules[].effectiveFrom` | body | string (date-time) | — | EffectiveFrom is when the rule took effect. | | `data.rules[].id` | body | string | — | ID is the rule's id. | | `data.rules[].ingestedSamples` | body | integer (uint64) | — | IngestedSamples is how many samples arrived while the rule was active. | | `data.rules[].ingestedSeries` | body | integer (uint64) | — | IngestedSeries is how many series arrived while the rule was active. | | `data.rules[].labels` | body | string\[] | — | Labels are the label names the rule matches. | | `data.rules[].matchType` | body | string | — | MatchType is drop or keep. | | `data.rules[].metricName` | body | string | — | MetricName is the metric the rule governs. | | `data.rules[].retainedSamples` | body | integer (uint64) | — | RetainedSamples is how many of them were kept. | | `data.rules[].retainedSeries` | body | integer (uint64) | — | RetainedSeries is how many of them were kept. | | `data.rules[].updatedAt` | body | string (date-time) | — | UpdatedAt is when the rule last changed. | | `data.rules[].updatedBy` | body | string | — | UpdatedBy is who last changed it. | | `data.total` | body | integer (int64) | — | Total is how many rules matched, across all pages. | | `status` | body | string | — | Status is "success". | Failure carries the platform error shape — see [Errors](https://docs.hanzo.ai/docs/errors). ## Examples **CLI** ```bash hanzo o11y metric_reduction_rules list ``` **SDK** **.ts** ```ts import { Configuration, O11yApi } from 'hanzoai'; const api = new O11yApi(new Configuration({ accessToken: process.env.HANZO_API_KEY })); const { data } = await api.listMetricReductionRules(); ``` **.py** ```python from hanzoai.cloud import ApiClient, Configuration from hanzoai.cloud.api import O11yApi client = ApiClient(Configuration(access_token=os.environ["HANZO_API_KEY"])) result = O11yApi(client).list_metric_reduction_rules() ``` **.go** ```go cfg := hanzoai.NewConfiguration() cfg.AddDefaultHeader("Authorization", "Bearer "+os.Getenv("HANZO_API_KEY")) client := hanzoai.NewAPIClient(cfg) resp, _, err := client.O11yAPI.ListMetricReductionRules(context.Background()).Execute() if err != nil { return err } ``` **.rs** ```rust use hanzo_client::apis::{configuration::Configuration, o11y_api}; let mut cfg = Configuration::new(); cfg.bearer_access_token = std::env::var("HANZO_API_KEY").ok(); let result = o11y_api::list_metric_reduction_rules(&cfg, Default::default()).await?; ``` **.java** ```java import ai.hanzo.cloud.ApiClient; import ai.hanzo.cloud.api.O11yApi; ApiClient client = new ApiClient(); client.setBearerToken(System.getenv("HANZO_API_KEY")); var result = new O11yApi(client).listMetricReductionRules(); ``` **HTTP** ```bash curl https://api.hanzo.ai/v1/o11y/metric_reduction_rules \ -H "Authorization: Bearer $HANZO_API_KEY" ``` **MCP** Tool `o11y`, op `ListMetricReductionRules` — POST the JSON-RPC envelope to `https://api.hanzo.ai/v1/mcp`. ```bash curl -X POST https://api.hanzo.ai/v1/mcp \ -H "Authorization: Bearer $HANZO_API_KEY" \ -H "Content-Type: application/json" \ -d '{ "jsonrpc": "2.0", "id": 1, "method": "tools/call", "params": { "name": "o11y", "arguments": { "op": "ListMetricReductionRules", "input": {} } } }' ``` --- [O11y API](https://docs.hanzo.ai/docs/openapi/o11y) · [All Hanzo APIs](https://docs.hanzo.ai/docs/openapi) · [Interactive reference](https://docs.hanzo.ai/docs/openapi/reference)