Service Topology & Dependencies
What calls what, inferred from span parentage rather than from a diagram somebody drew once and stopped updating
Services
38
Dependencies
112
Unhealthy edges
5
Single points of failure
3
Critical paths
The chains a single failure takes the most services down with
Checkout
4 hopsedgeapi-gatewaycheckout-apiorders-db
orders-db has no read replica in the write path
Sign-in
5 hopsedgeapi-gatewayauth-serviceuser-servicesessions-cache
sessions-cache is single-node
Nightly load
4 hopstalendstaging-s3databrickswarehouse
no retry between staging and Databricks
Search
4 hopsedgeapi-gatewaysearch-apielasticsearch
three replicas, degrades to cached results
Most depended on
Fan-in: how many services break if this one does
Dependency edges
Caller → callee, with the volume and error rate of that specific pair
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