Bug: Syslog pump is sending unmarshalled JSON

[sjakos]

When using the syslog pump the output format is the unmarshalled JSON struct instead of a JSON string

Example: map[alias: api_id:1 ... ] instead of {"alias": "", "api_id": "1", ...}

Example pump.conf:

{
  "analytics_storage_type": "redis",
  "analytics_storage_config": {
    "type": "redis",
    "host": "tyk-redis",
    "port": 6379,
    "hosts": null,
    "username": "",
    "password": "",
    "database": 0,
    "optimisation_max_idle": 100,
    "optimisation_max_active": 0,
    "enable_cluster": false,
    "redis_use_ssl": false,
    "redis_ssl_insecure_skip_verify": true
  },
  "log_format": "json",
  "purge_delay": 2,
  "pumps": {
    "syslog": {
      "name": "syslog",
      "meta": {
        "network_addr": "syslog-ng:1414",
        "transport": "udp",
        "log_level": 6,
        "tag": "gateway"
      }
    }
  },
  "dont_purge_uptime_data": true
}

Output sent to syslog:

<6>2023-03-17T13:20:46Z e49b4ad93c78 gateway[1]: map[alias: api_id:1 api_key:00000000 api_name:Test API api_version:Non Versioned content_length:%!s(int64=0) host:httpbin.org ip_address:192.168.160.1 method:GET oauth_id: org_id:1 path:/get raw_path:/get raw_request: raw_response: request_time_ms:%!s(int64=3274) response_code:%!s(int=200) timestamp:2023-03-17 13:20:46.0235235 +0000 UTC user_agent:Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/111.0.0.0 Safari/537.36]