Repeat Snapshots JSON

StackState v6.0

Overview

This page describes the exact JSON messages that can be sent for the health synchronization Repeat Snapshots consistency model.

JSON property: "health"

Health can be sent to the StackState Receiver API using the "health" property of the common JSON object.

Example health `repeat_snapshots` JSON

{
   "apiKey":"<STACKSTATE_RECEIVER_API_KEY>",
   "collection_timestamp":1585818978,
   "internalHostname":"lnx-343242.srv.stackstate.com",
   "health":[
      {
        "consistency_model": "REPEAT_SNAPSHOTS",
        "start_snapshot": {
          "repeat_interval_s": 50
          //"expiry_interval_s": 200 Optional
        },
        "stop_snapshot": {},
        "stream": {
          "urn": "urn:health:sourceId:streamId"
          //"sub_stream_id": "subStreamId" Optional
        },
        "check_states": [
          {
            "checkStateId": "checkStateId1",
            "message": "Server Running out of disk space",
            "health": "Deviating",
            "topologyElementIdentifier": "server-1",
            "name": "Disk Usage"
          },
          {
            "checkStateId": "checkStateId2",
            "message": "Provisioning failed. [Learn more](https://www.any-link.com)",
            "health": "critical",
            "topologyElementIdentifier": "server-2",
            "name": "Health monitor"
          }
        ]
      }
   ]
}

Every health Repeat Snapshots data payload has the following details:

• start_snapshot - Optional. A start of a snapshot needs to be processed before processing check_states. This enables StackState to diff a stream snapshot with the previously received one and delete check states that are no longer present in the snapshot. It carries the following fields as snapshot metadata:

  • repeat_interval_s - Time in seconds. The frequency with which the external source will send health data to StackState. Max allowed value is 1800 (30 minutes).

  • expiry_interval_s - Time in seconds. The time to wait after the last update before an external check is deleted by StackState. Required when using sub streams.

• stop_snapshot - Optional. An end of a snapshot will be processed after processing thecheck_states.

• stream - Object providing identification regarding which snapshots and check_states belong together. It has the following fields:

  • urn - Data source and stream ID encoded as a StackState URN that matches the following convention: urn:health:<sourceId>:<streamId> where <sourceId> is the name if the external data source and <streamId> is a unique identifier for the health data stream.

  • sub_stream_id - Optional. Identifier for a subset of the stream health data. When the stream data is distributed and reported by several Agents, this allows snapshot lifecycles per sub_stream_id

• check_states - A list of check states. Each check state can have the following fields:

  • checkStateId - Identifier for the check state in the external system

  • message - Optional. Message to display in StackState UI. Data will be interpreted as markdown allowing to have links to the external system check that generated the external check state.

  • health - One of the following StackState Health state values: Clear, Deviating, Critical.

  • topologyElementIdentifier - Used to bind the check state to a StackState topology element.

  • name - Name of the external check state.

Send health to StackState

Health can be sent in one JSON message via HTTP POST or using the stac CLI command stac health send. In the example below, a snapshot containing two check states is sent to StackState from a single external monitoring system.

curl

curl -X POST \
 '<STACKSTATE_RECEIVER_API_ADDRESS>' \
 -H 'Content-Type: application/json' \
 -d '{
  "collection_timestamp": 1548857167,
  "internalHostname": "local.test",
  "health": [
    {
      "consistency_model": "REPEAT_SNAPSHOTS",
      "start_snapshot": {
        "repeat_interval_s": 300
      },
      "stop_snapshot": {},
      "stream": {
        "urn": "urn:health:sourceId:streamId"
      },
      "check_states": [
        {
          "checkStateId": "checkStateId1",
          "message": "Server Running out of disk space",
          "health": "Deviating",
          "topologyElementIdentifier": "server-1",
          "name": "Disk Usage"
        },
        {
          "checkStateId": "checkStateId2",
          "message": "Provisioning failed. [Learn more](https://www.any-link.com)",
          "health": "critical",
          "topologyElementIdentifier": "server-2",
          "name": "Health monitor"
        }
      ]
    }
  ]
}'

CLI: stac (deprecated)

From StackState v5.0, the old sts CLI is called stac. The old CLI is now deprecated.

The new sts CLI replaces the stac CLI. It's advised to install the new sts CLI and upgrade any installed instance of the old sts CLI to stac. For details see:

• Which version of the sts CLI am I running?

• Install the new sts CLI and upgrade the old sts CLI to stac

• Comparison between the CLIs

stac health send start urn:health:sourceId:streamId \
  --repeat-interval-seconds 300

stac health send check-state urn:health:sourceId:streamId \
  checkStateId1 "Disk Usage" "server-1" deviating \
  --message "Deviating Server Running out of disk space" --consistency-model="REPEAT_SNAPSHOTS"

stac health send check-state urn:health:sourceId:streamId \
  checkStateId2 "Health monitor" "server-2" critical \
  --message "Provisioning failed. [Learn more](https://www.any-link.com)" --consistency-model="REPEAT_SNAPSHOTS"

stac health send stop urn:health:sourceId:streamId

CLI: sts

The new sts CLI doesn't support sending health states. This will only be supported by directly reaching out to the receiver API.