Drop `Flume.index_stream()`, `._sampling.open_sample_stream()` replaces it

piker/data/flows.py

@@ -22,17 +22,11 @@ real-time data processing data-structures.
 
 """
 from __future__ import annotations
-from contextlib import asynccontextmanager as acm
-from functools import partial
 from typing import (
-    AsyncIterator,
     TYPE_CHECKING,
 )
 
 import tractor
-from tractor.trionics import (
-    maybe_open_context,
-)
 import pendulum
 import numpy as np
 
@@ -45,9 +39,6 @@ from ._sharedmem import (
     ShmArray,
     _Token,
 )
-from ._sampling import (
-    open_sample_stream,
-)
 # from .._profile import (
 #     Profiler,
 #     pg_profile_enabled,
@@ -151,26 +142,6 @@ class Flume(Struct):
     async def receive(self) -> dict:
         return await self.stream.receive()
 
-    @acm
-    async def index_stream(
-        self,
-        delay_s: float = 1,
-
-    ) -> AsyncIterator[int]:
-
-        if not self.feed:
-            raise RuntimeError('This flume is not part of any ``Feed``?')
-
-        # TODO: maybe a public (property) API for this in ``tractor``?
-        portal = self.stream._ctx._portal
-        assert portal
-
-        # XXX: this should be singleton on a host,
-        # a lone broker-daemon per provider should be
-        # created for all practical purposes
-        async with open_sample_stream(float(delay_s)) as stream:
-            yield stream
-
     def get_ds_info(
         self,
     ) -> tuple[float, float, float]: