Logs missing "service" tag

[electricmonk]

Log messages reported by Boyar are missing the Service tag (service=boyar), and as a result we can't easily filter out Boyar-related logs in logz.io

{
  "_index": "logzioCustomerIndex191121_v7",
  "_type": "doc",
  "_id": "AW6MkAFCq1R_4Y9gv_1M.account-65212",
  "_version": 1,
  "_score": null,
  "_source": {
    "commit": "89192391aaefbe34d6833233e6c684b91cb18b0a",
    "source": "boyar/report_status.go:41",
    "type": "prod",
    "createdAt": "2019-11-20T11:11:41Z",
    "function": "boyar.ReportStatus",
    "state": "started",
    "app": "boyar",
    "workerId": "go83fvun34ezwsnqgf9kprdgs",
    "level": "info",
    "message": "service status",
    "version": "v0.20.0",
    "tags": [
      "_logz_http_bulk_json_8070"
    ],
    "node": "d5F2f401742568bcb6Fc0fd54C2B2eb1B75f8556",
    "@timestamp": "2019-11-21T06:04:37.864911039Z",
    "_logzio_pattern": 3447044,
    "name": "orbs-network-chain-1000001-stack",
    "vcid": 1000001
  },
  "fields": {
    "@timestamp": [
      1574316277864
    ]
  },
  "highlight": {
    "message": [
      "@kibana-highlighted-field@service@/kibana-highlighted-field@ @kibana-highlighted-field@status@/kibana-highlighted-field@"
    ]
  },
  "sort": [
    1574316277864
  ]
}

[amir-arad]

use log.Service("boyar") instead of that