Deathtoll

Naive monitoring of remote nodes and alerting when they are going down.

Available under the terms of MPL 2.0 license.

How to use

There are two ways:

• through the watch env variable, see:

  {deathtoll, [
      {watch, [
          {google, [
              {auditor, {deathtoll_audit_http, [
                  {url, "https://www.google.ru/"},
                  {expect, {status, 200}}
              ]}},
              {alarms, [
                  {deathtoll_alarm_logger, []}
              ]},
              {interval, 8}
          ]}
      ]}
  ]}

• through the call to deathtoll:watch/2, much the same thing but with bare hands:

deathtoll:watch(
  google,
  [
      {auditor, {deathtoll_audit_http, [
          {url, "https://www.google.ru/"},
          {expect, {status, 200}}
      ]}},
      {alarms, [
          {deathtoll_alarm_logger, []}
      ]},
      {interval, 8}
  ]
).

You can deathtoll:unwatch/1 too, yay!

What’s the thing

Every ’watch’ is a combination of an auditor, up to a few alarmists each of which could provide means to set a formatter. Moreover, every ’watch’ is hell of a supervior.

There is a couple of options you, as a proud user, could pass to each component. Sad to say, they are yet to be documented. Meanwhile you could consult a couple of modules, there are specs all over.