feat(server): GET /api/hosts/:name returns latest fast/medium/slow samples

server/lib/server_web/controllers/host_controller.ex

@@ -0,0 +1,30 @@
+defmodule ServerWeb.HostController do
+  use ServerWeb, :controller
+
+  alias Server.{Metrics, Repo, Schema.Host}
+
+  def show(conn, %{"name" => name}) do
+    case Repo.get_by(Host, name: name) do
+      nil ->
+        conn
+        |> put_status(:not_found)
+        |> json(%{error: "host_not_found"})
+
+      %Host{} = host ->
+        samples =
+          for interval <- ~w(fast medium slow),
+              sample = Metrics.latest_sample(host.id, interval),
+              into: %{} do
+            {interval, %{collected_at: sample.collected_at, payload: sample.payload}}
+          end
+
+        json(conn, %{
+          name: host.name,
+          status: host.status,
+          agent_version: host.agent_version,
+          last_seen_at: host.last_seen_at,
+          samples: samples
+        })
+    end
+  end
+end