How do you configure Dependabot for a monorepo with multiple package ecosystems?

Each distinct package ecosystem/directory combination in a monorepo needs its own separate entry under updates in dependabot.yml — Dependabot doesn't automatically discover and handle multiple manifests within one repository without being told about each one explicitly.

updates:
  - package-ecosystem: "npm"
    directory: "/services/frontend"
    schedule:
      interval: "weekly"

  - package-ecosystem: "pip"
    directory: "/services/backend"
    schedule:
      interval: "weekly"

  - package-ecosystem: "docker"
    directory: "/services/backend"
    schedule:
      interval: "monthly"

Note that the same directory can appear multiple times across different package-ecosystem entries (as shown with /services/backend above) if that directory contains manifests for more than one ecosystem — a Python service with its own Dockerfile, for instance, needs both a pip entry and a docker entry pointing at the same directory.

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