RedAlert

Monitor events that do NOT happen in designated schedule.

How it works

If you ever use cron-like scheduling tool you would have experienced this: it's very trivial to identify if a task/job run, basically you just need to check the log. However, it's not so if your expected event didn't occur. More than likely you would need to scan through the log of the entire period to check if it's delayed or missed.

RedAlert, inspired by Dead Man's Snitch, attempts to provide a very simple mechanism to give you a notification (by default a log message), that an event is missed.

Installation

1. Add red_alert to your list of dependencies in mix.exs:

```elixir
def deps do
  [{:red_alert, "~> 0.2.0"}]
end
```

1. Ensure red_alert is started before your application:

```elixir
def application do
  [applications: [:red_alert]]
end
```

Configuration

1. Define the schedules in your config.exs:

```elixir
config :red_alert,
  schedules: %{AnyTag1 => :every_15mins, AnyTag2 => :every_1day},
  notify: [&Notifier.notify/1]
```
Where:
  - `schedules`: The keys are the event `tags` you would call with [RedAlert.snooze/1](https://hexdocs.pm/red_alert/RedAlert.html#snooze/1), and the values are the corresponding intervals (available options found in `RedAlert.Interval`).
  - `notify`: Optional list of callback functions which would receive notifications. The default callback is [RedAlert.Monitor.notify/1](https://hexdocs.pm/red_alert/RedAlert.Monitor.html#notify/1).

1. In your code that emits the event, add:

```elixir
RedAlert.snooze AnyTag1
```