Metrics do not display zero-values correctly

[echlebek]

Expected Behavior

I expect to see

      "points": [
        {
          "name": "percent_packet_loss",
          "value": 0,
          "timestamp": 1525723224,
          "tags": []
        },
        {
          "name": "rta",
          "value": 0.8,
          "timestamp": 1525723224,
          "tags": []
        }
      ]

Current Behavior

I see:

      "points": [
        {
          "name": "percent_packet_loss",
          "timestamp": 1525723224,
          "tags": []
        },
        {
          "name": "rta",
          "value": 0.8,
          "timestamp": 1525723224,
          "tags": []
        }
      ]

Possible Solution

Remove omitempty json tag from the generated datatype.

Steps to Reproduce (for bugs)

1. create a check that emits PING ok - Packet loss = 0%, RTA = 0.80 ms | percent_packet_loss=0, rta=0.80 with a metric format of nagios_perfdata.
2. List the generated event in JSON format.

Context

Bug filed while doing beta QA.

Your Environment

• Sensu version used: e91bfb3
• Build and run method: ./build.sh docker, docker-compose up
• Operating System and version: Fedora 26