# `Collector.Sender`

Sends events to Collector in the background, one at a time, so that a
slow or unreachable Collector never slows the app down.

  * The queue is bounded (1000 events by default); when full, the
    oldest event is dropped.
  * A 5xx or network error resends the same event (same uuid, so it is
    counted once) after a backoff of 1s, 2s, 4s, … up to a minute, at
    most 8 times.
  * An event that can't be encoded as JSON is dropped.
  * A 429 means "slow down": that event was already counted, so it is
    dropped, and sending pauses for `Retry-After` seconds.
  * 400, 401, 403, 404, 413 and 422 drop the event; resending can't help.

# `child_spec`

Returns a specification to start this module under a supervisor.

See `Supervisor`.

# `send`

Queues `event`. Never blocks.

# `start_link`

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*Consult [api-reference.md](api-reference.md) for complete listing*