matrix-public-archive/config/config.default.json

{
  "basePort": "3050",
  "basePath": "http://localhost:3050",
  "matrixServerUrl": "http://localhost:8008/",
  "matrixServerName": "localhost",
  // Set this to 100 since that is the max that Synapse will backfill even if you do a
  // `/messges?limit=1000` and we don't want to miss messages in between.
  "archiveMessageLimit": 100,
  "requestTimeoutMs": 25000,
  "logOutputFromChildProcesses": false,
  //"stopSearchEngineIndexing": true,
  // Tracing
  //"jaegerTracesEndpoint": "http://localhost:14268/api/traces",

  // Testing
  "testMatrixServerUrl1": "http://localhost:11008/",
  "testMatrixServerUrl2": "http://localhost:12008/",

  // Secrets
  //"matrixAccessToken": "xxx"
}