Append spans for your org
Takes `{spans:[{traceId, spanId, parentId, name, startNs, endNs, attrs}]}`, appends each, and answers `{written}` — the number of spans sent.
POST /v1/metrics/traces/write
| Address | https://api.hanzo.ai/v1/metrics/traces/write |
| Method | POST |
| Operation | post_metrics_traces_write |
| Auth | Authorization: Bearer $HANZO_API_KEY |
Takes {spans:[{traceId, spanId, parentId, name, startNs, endNs, attrs}]}, appends each, and answers {written} — the number of spans sent. Every span is indexed by its trace id as it lands, which is what makes the waterfall read possible without a second store.
Times are NANOSECONDS since the Unix epoch. Retention is a bounded ring of 1048576 spans per org: past that the OLDEST are evicted to keep the newest 1048576, and the trace index is rebuilt — so a long-lived trace can lose its early spans while its later ones survive, and a waterfall read is best-effort against retention, not a guarantee.
The tenant is the gateway-minted X-Org-Id header, falling back to the deployment brand and then default. A body that does not decode is 400.
Request
The document declares no body for POST /v1/metrics/traces/write. The handler is typed in cloud but its shape is not yet emitted, so the fields are not listed here — ask the MCP door's describe for post_metrics_traces_write, which answers from the running route.
Response
The document declares no response body for this operation. It answers 200 on success and the platform error shape on failure — see Errors.
Examples
hanzo has no subcommand for this operation — the CLI serves only what cloud's live route table confirms. Use HTTP or an SDK.
import { Configuration, MetricsApi } from 'hanzoai';
const api = new MetricsApi(new Configuration({ accessToken: process.env.HANZO_API_KEY }));
const { data } = await api.postMetricsTracesWrite();from hanzoai.cloud import ApiClient, Configuration
from hanzoai.cloud.api import MetricsApi
client = ApiClient(Configuration(access_token=os.environ["HANZO_API_KEY"]))
result = MetricsApi(client).post_metrics_traces_write()cfg := cloud.NewConfiguration()
cfg.AddDefaultHeader("Authorization", "Bearer "+os.Getenv("HANZO_API_KEY"))
client := cloud.NewAPIClient(cfg)
resp, _, err := client.MetricsAPI.PostMetricsTracesWrite(context.Background()).Execute()
if err != nil {
return err
}use hanzo_cloud::apis::{configuration::Configuration, metrics_api};
let mut cfg = Configuration::new();
cfg.bearer_access_token = std::env::var("HANZO_API_KEY").ok();
let result = metrics_api::post_metrics_traces_write(&cfg, Default::default()).await?;import ai.hanzo.cloud.ApiClient;
import ai.hanzo.cloud.api.MetricsApi;
ApiClient client = new ApiClient();
client.setRequestInterceptor(b -> b.header("Authorization", "Bearer " + System.getenv("HANZO_API_KEY")));
var result = new MetricsApi(client).postMetricsTracesWrite();The method above is the one at the current release of the document. [email protected] (npm) and [email protected] (PyPI) were generated from an earlier release, where this operation carried a different id, so it spells the method differently — regenerating the clients is what makes the two agree. SDKs →
curl -X POST https://api.hanzo.ai/v1/metrics/traces/write \
-H "Authorization: Bearer $HANZO_API_KEY"The door reaches metrics through the metrics tool, which names its 11 operations with its own verbs — this one among them, under a name only the door declares. describe explains any of them:
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": "get_log_health"
}
}
}'How is this guide?