http_server: api: metrics: remove unused header
#include <fluent-bit/flb_http_server.h>
#include <msgpack.h>
-#define _BSD_SOURCE
-
-#include <sys/time.h>
-
#define PROMETHEUS_HEADER "text/plain; version=0.0.4"
#define null_check(x) do { if (!x) { goto error; } else {sds = x;} } while (0)
