Service topology

curl "http://localhost:5080/api/v1/web/topology?from=2026-10-04T09:00:00Z&to=2026-10-04T10:00:00Z" \
  -H "authorization: Bearer $MS_JWT"

{
  "nodes": [
    { "id": "checkout", "name": "checkout", "error_rate": 0.0278, "p95_ms": 90.0, "rps": 0.1, "span_count": 360 },
    { "id": "frontend", "name": "frontend", "error_rate": 0.0278, "p95_ms": 90.0, "rps": 0.1, "span_count": 360 }
  ],
  "edges": [
    { "source": "frontend", "target": "checkout", "rps": 0.1, "err_rate": 0.0278, "p95_ms": 90.0 }
  ]
}

curl "http://localhost:5080/api/v1/web/topology?from=2026-10-04T09:00:00Z&to=2026-10-04T10:00:00Z" \
  -H "authorization: Bearer $MS_JWT"

{
  "nodes": [
    { "id": "checkout", "name": "checkout", "error_rate": 0.0278, "p95_ms": 90.0, "rps": 0.1, "span_count": 360 },
    { "id": "frontend", "name": "frontend", "error_rate": 0.0278, "p95_ms": 90.0, "rps": 0.1, "span_count": 360 }
  ],
  "edges": [
    { "source": "frontend", "target": "checkout", "rps": 0.1, "err_rate": 0.0278, "p95_ms": 90.0 }
  ]
}

GET /api/v1/web/topology

Aggregates the service-graph edges of a time window into nodes and edges, with request rate, error rate, and latency. The edges come from the service graph that MoleSignal derives from trace spans. See Service map. The call requires streams.query, or sys.telemetry.read in the system scope. Query parameters

Param	Type	Required	Notes
`from`	string	Yes	The start of the window, as an RFC 3339 timestamp.
`to`	string	Yes	The end of the window, as an RFC 3339 timestamp. It must not precede `from`.

curl "http://localhost:5080/api/v1/web/topology?from=2026-10-04T09:00:00Z&to=2026-10-04T10:00:00Z" \
  -H "authorization: Bearer $MS_JWT"

{
  "nodes": [
    { "id": "checkout", "name": "checkout", "error_rate": 0.0278, "p95_ms": 90.0, "rps": 0.1, "span_count": 360 },
    { "id": "frontend", "name": "frontend", "error_rate": 0.0278, "p95_ms": 90.0, "rps": 0.1, "span_count": 360 }
  ],
  "edges": [
    { "source": "frontend", "target": "checkout", "rps": 0.1, "err_rate": 0.0278, "p95_ms": 90.0 }
  ]
}

Response

Field	Notes
`nodes[].id`, `nodes[].name`	The service name. Nodes are sorted by name.
`nodes[].span_count`	The requests on every edge that touches the service, as client or as server.
`nodes[].error_rate`, `edges[].err_rate`	Errors divided by requests, from 0 to 1.
`nodes[].rps`, `edges[].rps`	Requests divided by the length of the window in seconds.
`nodes[].p95_ms`, `edges[].p95_ms`	The highest p95 latency among the aggregated buckets, in milliseconds. This is not a p95 of the whole window.
`edges[].source`, `edges[].target`	The client service and the server service. Edges are sorted by source, then target.

A window without edges answers empty arrays. Errors

Status	Cause
`400`	`from` or `to` is missing or is not an RFC 3339 timestamp, or `to` precedes `from`.
`403`	The token lacks `streams.query`.

Last modified on October 26, 2026

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