Host metrics

Posting metrics

This will transmit metrics collected by the agent to Mackerel. Recorded values can be checked using web graphs, etc.

POST /api/v0/tsdb

If old values are being transmitted to the API, the values on the Mackerel interface will be overwritten. If posting with a timestamp older than 24 hours, those metrics will not be recorded (a status code 200 response will be returned). Additionally, an alert will not occur for an old value, even if a threshold is surpassed, since alerts occur based on the latest values from the Mackerel interface.

Required permissions for API key

  • Read
  • Write

Input

[ <metricValue>, <metricValue>, … ]

<metricValue> : an object that holds the following keys.

KEY TYPE DESCRIPTION
hostId string host ID (given by the server when the host was registered)
name string metric name([a-zA-Z0-9._-]+
time number unix time
value number measured value at time

Response

Success

{
  "sucess": true
}

Error

STATUS CODE DESCRIPTION
403 when the API doesn't have the required permissions / when accessing from outside the permitted IP address range
other than 200 any error other than the above

Getting host metrics

This will get metric values that have been posted by the agent.

GET /api/v0/hosts/<hostId>/metrics

Required permissions for API key

  • Read

Input (Query parameter)

With the following parameter, the metric name and time span to be collected will be assigned.

KEY TYPE DESCRIPTION
name string metric name(loadavg5, etc. More info → metric specs
from number the start of the time period you want metrics for (unix time)
to number the end of the time period you want metrics for (unix time)

Response

Success

{
  "metrics": [
    {
      "time": <time>,
      "value": <value>
    },
    {
      "time": <time>,
      "value": <value>
    },
    …
  }
}
  • response will be in chronological order
  • the <time> displayed will be in unix time

Error

STATUS CODE DESCRIPTION
404 when the host or metric doesn't exist
other than 200 any error other than the above

Getting latest metrics

This will get the latest metrics posted by the agent from each host.

GET /api/v0/tsdb/latest

Required permissions for API key

  • Read

Input (Query parameter)

With the following parameter, host and metric names will be assigned.

KEY TYPE DESCRIPTION
hostId string host ID, multiple assignments possible
name string metric name (loadavg5 etc. for more info→Metrics spec., multiple assignments possible

Response

{
  "tsdbLatest": {
    <hostId>: {
      <name>: <metricValue>,
      <name>: <metricValue>,
      …
    },
    <hostId>: {},
    …
  }
}

Error

STATUS CODE DESCRIPTION
403 when the API doesn't have the required permissions / when accessing from outside the permitted IP address range
other than 200 any error other than the above

Posting graph definitions

This will transmit custom metric graph definitions to Mackerel.

POST /api/v0/graph-defs/create

Required permissions for API key

  • Read
  • Write

Input

[ <graphDef>, <graphDef>, … ]

<graphDef> : an object that contains the following keys.

KEY TYPE DESCRIPTION
name string The part of the metric name before the last .. Must begin with custom..
displayName string [optional] The graph's display name.
unit string [optional] The type of the graph's values. Possible values are "float", "integer", "percentage", "bytes", "bytes/sec", and "iops"
metrics array [ <metric>, <metric>, ...] For metrics, refer to the chart below.

metric: an object that contains the following keys.

KEY TYPE DESCRIPTION
name string The custom metric name. Must begin with <graphDef>.name followed by a . and a name (which may contain [-a-zA-Z0-9_]+ , and wildcard characters * , or # )
displayName string [optional] The metric display name. If omitted, everything after the last . in the metric name will be used. By writing %1 or %2 , it's possible to use the first and second phrases that match the wildcard characters in the metric name.
isStacked boolean Indicates whether the metrics in question are displayed in stacked format or not. If false, the graph will be displayed in line format.

Example Input

[
  {
      "name" : "custom.cpu.foo",
      "displayName": "CPU",
      "unit":"percentage",
      "metrics": [
         { "name": "custom.cpu.foo.user", "displayName": "CPU user", "isStacked": true },
         { "name": "custom.cpu.foo.idle", "displayName": "CPU idle", "isStacked": true },
         ...
      ]
  },
  {
      "name" : "custom.wild.#",
      "displayName": "wildcard",
      "unit":"float",
      "metrics": [
         { "name": "custom.wild.#.foo", "displayName": "wild foo" },
         { "name": "custom.wild.#.bar", "displayName": "wild bar" },
         ...
      ]
  },
  {
    "name": "custom.cpu.bar",
    ...
  }
]

Response

Success

{
  "success": true
}

Error

STATUS CODE DESCRIPTION
403 when the API doesn't have the required permissions / when accessing from outside the permitted IP address range
other than 200 any error other than the above

Regarding custom metric names and wildcards

  • Characters that may be used in custom metric names include alphanumeric characters, hyphens (-), underscores (_), and non-consecutive dots (.).
  • Custom metric names must begin with custom.. (mackerel-agent will automatically attach custom.)
  • Wildcard characters (* or #) can be used independently in the names of graph definition metrics either between two dots . or after the last dot.
  • A wildcard characters will match a sequence of characters excluding dots (i.e. [-a-zA-Z0-9_]+).
  • The wildcard # can only be used once. The whole metric name should look like this ^custom(\.([-a-zA-Z0-9_]+|[*#]))+$.

If using the wildcard #, the graph's legend will be grouped by the portions of the metric names that matched with #. For example if there are two definitions custom.docker.cpu.#.user and custom.docker.cpu.#.system, and six custom metrics

  • custom.docker.cpu.f5240a.user
  • custom.docker.cpu.f5240a.system
  • custom.docker.cpu.e866aq.user
  • custom.docker.cpu.e866aq.system
  • custom.docker.cpu.e552ad.user
  • custom.docker.cpu.e552ad.system

are transmitted, the graph legend will be grouped as shown below.

f:id:mackerelio:20150909172654p:plain

Additionally, if a transmission of custom metrics of a graph definition with wildcards isn't received within a specified time span (roughly 6 to 8 hours) the definition will automatically be deleted, so please use caution.