def foo(): 

  metrics('goal_fps').set(f)           # a gauge because we called set()

  with metrics('recompute'): ...       # ctxmgr also makes a timer

     time_this_part()

I don't see a need for labels yet, but maybe some code will want like

metrics('foo', label1=one). Need histogram? Info?

"""

from typing import Dict, Tuple, Callable, Type, TypeVar, cast

from prometheus_client import Counter, Gauge, Metric, Summary

from prometheus_client.exposition import generate_latest

from prometheus_client.registry import REGISTRY

_created: Dict[str, Metric] = {}

# _process=sys.argv[0]

# def setProcess(name: str):

#   global _process

#   _process = name

MT = TypeVar("MT")

    def observe(self, x: float):

        return self._ensure(Summary).observe(x)

    def __enter__(self):

        return self._ensure(Summary).__enter__()

def metrics(name: str, **labels):

    return _MetricsRequest(name, **labels)

"""

stuff we used to have in greplin. Might be nice to get (client-side-computed) min/max/stddev back.

class PmfStat(Stat):

  A stat that stores min, max, mean, standard deviation, and some

  percentiles for arbitrary floating-point data. This is potentially a

  bit expensive, so its child values are only updated once every

  twenty seconds.