[Bug]: Alert page, displays a zero, when Latest time/value is not present

[shyamvalsan]

Bug description

Alert page, displays a zero, when Latest time/value is not present

Expected behavior

Not show the weird zero?

Steps to reproduce

1. Visible on cloud prod and demo space

Screenshots

Error Logs

N/A

Desktop

N/A

Additional context

No response

[hugovalente-pm]

was trying to dig into see why this happens but can't pinpoint where the latest value is mapped from, maybe @netdata/cloud-fe or @car12o can help on this one

the payload of the /alert_transitions for this a case like this - current alert on Netdata People space:

{
    "api": 2,
    "transitions": [
        {
            "transition_id": "3aeca29c-c698-4cc6-a7e7-5cd90fd691c9",
            "node_id": "fa3217e1-2e7d-4b39-9619-c95c94cba8f7",
            "alert": "10min_disk_backlog",
            "instance": "disk_backlog.mmcblk0",
            "instance_n": "disk_backlog.mmcblk0",
            "context": "disk.backlog",
            "when": 1699334164,
            "new": {
                "status": "WARNING",
                "value": 9044.362181813924
            },
            "old": {
                "status": "CLEAR",
                "value": 3.0783333280000007
            },
            "summary": "Disk mmcblk0 backlog",
            "info": "Average backlog size of the mmcblk0 disk over the last 10 minutes",
            "src": "158@/usr/lib/netdata/conf.d/health.d/disks.conf",
            "exec": "/usr/libexec/netdata/plugins.d/alarm-notify.sh",
            "config_hash_id": "823565b5-4a9e-ed82-4876-fee349d6b67c",
            "units": "ms",
            "component": "Disk",
            "classification": "Latency",
            "to": "silent"
        }
    ],
    "timings": {
        "routing_ms": 0,
        "node_max_ms": 0,
        "total_ms": 1
    }
}

[car12o]

@hugovalente-pm they come from /alerts endpoint on keys v (value) t (time), they represent the current values for these variables.

the values for when it was triggered are on keys tr_v (triggered value) tr_t (triggered time).

{
  "api": 2,
  "nodes": ...,
  "alerts": ...,
  "alert_instances": [
    {
      "ni": 9,
      "ati": 0,
      "sum": "Disk / space usage",
      "info": "Total space utilization of disk /",
      "nm": "disk_space_usage",
      "ch": "disk_space._",
      "ch_n": "disk_space._",
      "ctx": "disk.space",
      "st": "WARNING",
      "v": 94.2504901,
      "t": 1699436372,
      "tr_i": "8035b1b9-62e6-4560-82ab-637f12747b41",
      "tr_v": 90.07800719809327,
      "tr_t": 1698453197,
      "units": "%",
      "cfg": "f4eca216-632b-0ea8-2252-890c59ca2d1c",
      "src": "12@/usr/lib/netdata/conf.d/health.d/disks.conf",
      "exec": "/usr/libexec/netdata/plugins.d/alarm-notify.sh",
      "tp": "System",
      "cl": "Utilization",
      "cm": "Disk",
      "to": "sysadmin",
      "slc": {
        "state": "NONE"
      }
    }
  ],
  "timings": ...
}

bear in mind if the alert is not raised anymore we have no current values for it.