Log streaming: Datadog

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{
  "ddsource": "fastly",
  "service": "%{req.service_id}V",
  "date": "%{begin:%Y-%m-%dT%H:%M:%S%z}t",
  "time_start": "%{begin:%Y-%m-%dT%H:%M:%S%Z}t",
  "time_end": "%{end:%Y-%m-%dT%H:%M:%S%Z}t",
  "http": {
    "request_time_ms": %{time.elapsed.msec}V,
    "method": "%m",
    "url": "%{json.escape(req.url)}V",
    "useragent": "%{json.escape(req.http.User-Agent)}V",
    "referer": "%{json.escape(req.http.referer)}V",
    "protocol": "%H",
    "request_x_forwarded_for": "%{X-Forwarded-For}i",
    "status_code": "%s"
  },
  "network": {
    "client": {
      "ip": "%h",
      "name": "%{client.as.name}V",
      "number": "%{client.as.number}V",
      "connection_speed": "%{client.geo.conn_speed}V"
    },
    "destination": {
      "ip": "%A"
    },
  "geoip": {
  "geo_city": "%{client.geo.city.utf8}V",
  "geo_country_code": "%{client.geo.country_code}V",
  "geo_continent_code": "%{client.geo.continent_code}V",
  "geo_region": "%{client.geo.region}V"
  },
  "bytes_written": %B,
  "bytes_read": %{req.body_bytes_read}V
  },
  "host":"%{if(req.http.Fastly-Orig-Host, req.http.Fastly-Orig-Host, req.http.Host)}V",
  "origin_host": "%v",
  "is_ipv6": %{if(req.is_ipv6, "true", "false")}V,
  "is_tls": %{if(req.is_ssl, "true", "false")}V,
  "tls_client_protocol": "%{json.escape(tls.client.protocol)}V",
  "tls_client_servername": "%{json.escape(tls.client.servername)}V",
  "tls_client_cipher": "%{json.escape(tls.client.cipher)}V",
  "tls_client_cipher_sha": "%{json.escape(tls.client.ciphers_sha)}V",
  "tls_client_tlsexts_sha": "%{json.escape(tls.client.tlsexts_sha)}V",
  "is_h2": %{if(fastly_info.is_h2, "true", "false")}V,
  "is_h2_push": %{if(fastly_info.h2.is_push, "true", "false")}V,
  "h2_stream_id": "%{fastly_info.h2.stream_id}V",
  "request_accept_content": "%{Accept}i",
  "request_accept_language": "%{Accept-Language}i",
  "request_accept_encoding": "%{Accept-Encoding}i",
  "request_accept_charset": "%{Accept-Charset}i",
  "request_connection": "%{Connection}i",
  "request_dnt": "%{DNT}i",
  "request_forwarded": "%{Forwarded}i",
  "request_via": "%{Via}i",
  "request_cache_control": "%{Cache-Control}i",
  "request_x_requested_with": "%{X-Requested-With}i",
  "request_x_att_device_id": "%{X-ATT-Device-Id}i",
  "content_type": "%{Content-Type}o",
  "is_cacheable": %{if(fastly_info.state~"^(HIT|MISS)$", "true","false")}V,
  "response_age": "%{Age}o",
  "response_cache_control": "%{Cache-Control}o",
  "response_expires": "%{Expires}o",
  "response_last_modified": "%{Last-Modified}o",
  "response_tsv": "%{TSV}o",
  "server_datacenter": "%{server.datacenter}V",
  "req_header_size": %{req.header_bytes_read}V,
  "resp_header_size": %{resp.header_bytes_written}V,
  "socket_cwnd": %{client.socket.cwnd}V,
  "socket_nexthop": "%{client.socket.nexthop}V",
  "socket_tcpi_rcv_mss": %{client.socket.tcpi_rcv_mss}V,
  "socket_tcpi_snd_mss": %{client.socket.tcpi_snd_mss}V,
  "socket_tcpi_rtt": %{client.socket.tcpi_rtt}V,
  "socket_tcpi_rttvar": %{client.socket.tcpi_rttvar}V,
  "socket_tcpi_rcv_rtt": %{client.socket.tcpi_rcv_rtt}V,
  "socket_tcpi_rcv_space": %{client.socket.tcpi_rcv_space}V,
  "socket_tcpi_last_data_sent": %{client.socket.tcpi_last_data_sent}V,
  "socket_tcpi_total_retrans": %{client.socket.tcpi_total_retrans}V,
  "socket_tcpi_delta_retrans": %{client.socket.tcpi_delta_retrans}V,
  "socket_ploss": %{client.socket.ploss}V
}