# Create hosts URL: https://docs.hanzo.ai/docs/openapi/o11y/post-o11y-infra-monitoring-hosts > Lists hosts with key infrastructure metrics — CPU, memory, I/O wait and disk usage percentages and 15-minute load — plus an active/inactive status from whether the host reported in the last ten minutes. `POST /v1/o11y/infra_monitoring/hosts` > [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/infra_monitoring/hosts` | | **Method** | `POST` | | **Operation** | `post_o11y_infra_monitoring_hosts` | | **Auth** | `Authorization: Bearer $HANZO_API_KEY` | Lists hosts with key infrastructure metrics — CPU, memory, I/O wait and disk usage percentages and 15-minute load — plus an active/inactive status from whether the host reported in the last ten minutes. Rows answer as 'list' under the default host.name grouping or 'grouped\_list' under a custom groupBy; a metric with no data in the window answers -1. Filterable by expression and by status, orderable by any of the five metrics, paginated by offset and limit. ## Request 24 fields, body `application/json` (required). | Field | In | Type | Required | Description | | --------------------------- | ---- | -------------------------------- | -------- | --------------------------------------------------- | | `end` | body | integer (int64) | — | | | `filter` | body | o11y.HostFilter | — | | | `filter.Filter` | body | o11y.Filter | — | | | `filter.Filter.expression` | body | string | — | expression to filter by following the filter syntax | | `filter.filterByStatus` | body | any | — | | | `groupBy` | body | o11y.GroupByKey\[] | — | | | `groupBy[].description` | body | string | — | | | `groupBy[].fieldContext` | body | any | — | | | `groupBy[].fieldDataType` | body | any | — | | | `groupBy[].name` | body | string | yes | | | `groupBy[].signal` | body | any | — | | | `groupBy[].unit` | body | string | — | | | `limit` | body | integer (int64) | — | | | `offset` | body | integer (int64) | — | | | `orderBy` | body | o11y.querybuildertypesv5.OrderBy | — | | | `orderBy.direction` | body | any | — | direction to order by | | `orderBy.key` | body | o11y.OrderByKey | — | | | `orderBy.key.description` | body | string | — | | | `orderBy.key.fieldContext` | body | any | — | | | `orderBy.key.fieldDataType` | body | any | — | | | `orderBy.key.name` | body | string | yes | | | `orderBy.key.signal` | body | any | — | | | `orderBy.key.unit` | body | string | — | | | `start` | body | integer (int64) | — | | ## Response | Status | Body | Meaning | | --------- | ---------------------- | ----------------- | | `200` | o11y.O11yInfraHostsOut | ok | | `202` | Approval | held for approval | | `default` | problem-details | refused | `200` body — 22 fields. | Field | In | Type | Always | Description | | ---------------------------------- | ---- | ------------------------------- | ------ | -------------------- | | `data` | body | o11y.Hosts | — | | | `data.endTimeBeforeRetention` | body | boolean | — | | | `data.records` | body | o11y.HostRecord\[] | — | | | `data.records[].activeHostCount` | body | integer (int64) | — | | | `data.records[].cpu` | body | number (double) | — | | | `data.records[].diskUsage` | body | number (double) | — | | | `data.records[].hostName` | body | string | — | | | `data.records[].inactiveHostCount` | body | integer (int64) | — | | | `data.records[].load15` | body | number (double) | — | | | `data.records[].memory` | body | number (double) | — | | | `data.records[].meta` | body | object | — | | | `data.records[].meta.*` | body | string | — | | | `data.records[].status` | body | any | — | | | `data.records[].wait` | body | number (double) | — | | | `data.total` | body | integer (int64) | — | | | `data.type` | body | any | — | | | `data.warning` | body | o11y.QueryWarnData | — | | | `data.warning.message` | body | string | — | | | `data.warning.url` | body | string | — | | | `data.warning.warnings` | body | o11y.QueryWarnDataAdditional\[] | — | | | `data.warning.warnings[].message` | body | string | — | | | `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 infra_monitoring hosts ``` **SDK** **.ts** ```ts import { Configuration, O11yApi } from 'hanzoai'; const api = new O11yApi(new Configuration({ accessToken: process.env.HANZO_API_KEY })); const { data } = await api.postO11yInfraMonitoringHosts({ end: 0, filter: {"Filter":{"expression":""},"filterByStatus":""} }); ``` **.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).post_o11y_infra_monitoring_hosts(end=0, filter={"Filter":{"expression":""},"filterByStatus":""}) ``` **.go** ```go cfg := hanzoai.NewConfiguration() cfg.AddDefaultHeader("Authorization", "Bearer "+os.Getenv("HANZO_API_KEY")) client := hanzoai.NewAPIClient(cfg) resp, _, err := client.O11yAPI.PostO11yInfraMonitoringHosts(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::post_o11y_infra_monitoring_hosts(&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).postO11yInfraMonitoringHosts(); ``` **HTTP** ```bash curl -X POST https://api.hanzo.ai/v1/o11y/infra_monitoring/hosts \ -H "Authorization: Bearer $HANZO_API_KEY" \ -H "Content-Type: application/json" \ -d '{ "end": 0, "filter": { "Filter": { "expression": "" }, "filterByStatus": "" } }' ``` **MCP** MCP reaches **o11y** through the `o11y` tool, which names its 307 operations with its own verbs — this one among them, under a name only MCP declares. `describe` explains any of them: ```bash curl -X POST https://api.hanzo.ai/v1/mcp \ -H "Content-Type: application/json" \ -d '{ "jsonrpc": "2.0", "id": 1, "method": "tools/call", "params": { "name": "describe", "arguments": { "op": "list_o11y_autocomplete_aggregate_attributes" } } }' ``` --- [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)