@type t() :: %ExSeq.CLEFEvent{
  exception: String.t() | nil,
  level: ExSeq.CLEFLevel.t(),
  message: String.t() | nil,
  parent_span_id: String.t() | nil,
  properties: map(),
  resource_attributes: map() | nil,
  span_id: String.t() | nil,
  span_kind: String.t() | nil,
  span_start: DateTime.t() | NaiveDateTime.t() | nil,
  timestamp: DateTime.t() | NaiveDateTime.t() | nil,
  trace_id: String.t() | nil
}

CLEF event

• timestamp – a DateTime (or NaiveDateTime) for the log time.
• message – the main log message string.
• exception – an exception stacktrace or error details.
• level – one of the ExSeq.CLEFLevel variants.
• trace_id – a string trace ID for distributed tracing.
• span_id – a string span ID for distributed tracing.
• span_start – a DateTime marking when the span began.
• span_kind – a string describing the kind of span (client, server, etc.).
• resource_attributes – a map of key/value pairs describing the resource.
• parent_span_id – a span ID for the parent span (if any).
• properties – additional arbitrary key/value pairs.