# `Otel.Metrics.Exemplar.Reservoir.SimpleFixedSize`
[🔗](https://github.com/yangbancode/otel/blob/main/lib/otel/metrics/exemplar/reservoir/simple_fixed_size.ex#L1)

A reservoir that uses uniformly-weighted random sampling.

Keeps at most `size` exemplars. Uses reservoir sampling algorithm:
the Nth measurement has a `size/N` probability of being kept,
replacing a random existing entry.

# `primitive`

```elixir
@type primitive() ::
  String.t() | {:bytes, binary()} | boolean() | integer() | float() | nil
```

# `primitive_any`

```elixir
@type primitive_any() ::
  primitive() | [primitive_any()] | %{required(String.t()) => primitive_any()}
```

# `state`

```elixir
@type state() :: %{
  size: pos_integer(),
  count: non_neg_integer(),
  exemplars: %{required(non_neg_integer()) => Otel.Metrics.Exemplar.t()}
}
```

# `collect`

```elixir
@spec collect(state :: state()) :: {[Otel.Metrics.Exemplar.t()], state()}
```

# `new`

```elixir
@spec new(opts :: map()) :: state()
```

# `offer`

```elixir
@spec offer(
  state :: state(),
  value :: number(),
  time :: non_neg_integer(),
  filtered_attributes :: %{required(String.t()) => primitive_any()},
  ctx :: Otel.Ctx.t()
) :: state()
```

---

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