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test: gate Oban queue-depth poller on :start_telemetry_poller flag

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MicrowavepropWeb.Telemetry's :telemetry_poller fires
dispatch_oban_queue_depth/0 every 30 s. In test env it runs outside
any Ecto sandbox owner, so its `Repo.all` against oban_jobs holds a
pool connection long enough to starve LiveView `render_async` tests
with 100 ms async windows — repro'd as flaky SkewtLive failures.

Same shape as the PromEx Oban plugin we already disable in test via
:prom_ex_include_oban_plugin. Add :start_telemetry_poller (defaults
to true) and toggle it off in config/test.exs. Production keeps the
30-second per-(queue,state) gauge.
This commit is contained in:
Graham McIntire 2026-05-08 10:40:45 -05:00
parent b8eea1bd45
commit be1ebdc035
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GPG key ID: F4ABF488E6029E59
2 changed files with 20 additions and 9 deletions
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7
config/test.exs
View file

@ -113,6 +113,13 @@ config :microwaveprop, nexrad_req_options: [plug: {Req.Test, Microwaveprop.Weath
config :microwaveprop, solar_req_options: [plug: {Req.Test, Microwaveprop.Weather.SolarClient}]
config :microwaveprop, srtm_req_options: [plug: {Req.Test, Microwaveprop.Terrain.Srtm}, retry: false]
config :microwaveprop, start_freshness_monitor: false
# The Oban queue-depth poller (`MicrowavepropWeb.Telemetry`) runs every
# 30 s outside any sandbox owner. Its query against `oban_jobs` holds a
# pool connection long enough to race LiveView `start_async` tests with
# 100 ms async windows (e.g. SkewtLive). Off in tests; the same
# poll-once-per-pod metric is irrelevant inside a single-process suite.
config :microwaveprop, start_telemetry_poller: false
config :microwaveprop, swpc_req_options: [plug: {Req.Test, Microwaveprop.SpaceWeather.SwpcClient}, retry: false]
config :microwaveprop, uwyo_req_options: [plug: {Req.Test, Microwaveprop.Weather.UwyoSoundingClient}, retry: false]

22
lib/microwaveprop_web/telemetry.ex
View file

@ -10,15 +10,19 @@ defmodule MicrowavepropWeb.Telemetry do
@impl true
def init(_arg) do
children = [
# Oban queue-depth is the only poller measurement and each replica
# issues the same GROUP-BY over oban_jobs. 30s gives enough fidelity
# for dashboard trends without burning ~3/min of identical queries
# per extra replica.
{:telemetry_poller, measurements: periodic_measurements(), period: 30_000}
# Add reporters as children of your supervision tree.
# {Telemetry.Metrics.ConsoleReporter, metrics: metrics()}
]
# Oban queue-depth is the only poller measurement and each replica
# issues the same GROUP-BY over oban_jobs. 30s gives enough fidelity
# for dashboard trends without burning ~3/min of identical queries
# per extra replica. Skipped in test (no sandbox owner → connection
# contention with LiveView async tests; identical pattern to the
# PromEx Oban plugin we already disable via
# `:prom_ex_include_oban_plugin`).
children =
if Application.get_env(:microwaveprop, :start_telemetry_poller, true) do
[{:telemetry_poller, measurements: periodic_measurements(), period: 30_000}]
else
[]
end
Supervisor.init(children, strategy: :one_for_one)
end