When a manual configuration is not provided, gateway requires an Apollo configuration

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We started getting these errors when our servers were starting up this morning. No changes on our side in a few months.

Error: When a manual configuration is not provided, gateway requires an Apollo configuration. See Managed federation overview - Apollo GraphQL Docs for more information. Manual configuration options include: serviceList, supergraphSdl, and experimental_updateServiceDefinitions.

We are omitting serviceList, but we have been running this code for a few months and just started failing yesterday.

    gateway = new ApolloGateway({
      debug: process.env.GRAPH_GATEWAY_DEBUG.toLowerCase() === 'true',

      // Experimental: Enabling this enables the query plan view in Playground.
      __exposeQueryPlanExperimental: true,

      buildService,
    });

    const graphManagerKey = await getGraphManagerKey();

    engine = {
      apiKey: graphManagerKey,
      graphVariant: process.env.ENVIRONMENT,
      sendVariableValues: { all: true },
    };