Graham McIntire
c7bc3ed5d0
Wires PromEx with its built-in Application / BEAM / Phoenix / Ecto /
Oban plugins plus a custom `Microwaveprop.PromEx.InstrumentPlugin`
that registers Prometheus histograms for every
`Microwaveprop.Instrument` span (HRRR/NEXRAD/IEM/GEFS/NARR/UWYO
/Elevation fetches, DB batch upserts, terrain analysis, radar
aggregation, propagation score band). Queue-depth gauges from the
10-second poller land at `microwaveprop_oban_queue_count{queue,state}`.
Router forwards `/metrics` to MicrowavepropWeb.MetricsPlug which
optionally requires a bearer token (`PROMETHEUS_AUTH_TOKEN` env var in
runtime.exs); leave it unset to expose metrics publicly and restrict
at the ingress / Cloudflare Access layer instead.
Example external Prometheus scrape config:
scrape_configs:
- job_name: microwaveprop
scrape_interval: 30s
metrics_path: /metrics
scheme: https
authorization:
type: Bearer
credentials: <token>
static_configs:
- targets: ['prop.w5isp.com:443']
47 lines
1.4 KiB
Elixir
47 lines
1.4 KiB
Elixir
defmodule Microwaveprop.PromEx do
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@moduledoc """
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Prometheus metrics exporter. Combines PromEx's built-in plugins for
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Application/BEAM/Phoenix/Ecto/Oban with our own custom metrics
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(Microwaveprop.Instrument spans, Oban queue-depth gauges).
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A dedicated Prometheus server outside the Kubernetes cluster scrapes
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`/metrics` over the app's normal HTTP endpoint. The `MicrowavepropWeb.Router`
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is responsible for making that route reachable.
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"""
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use PromEx, otp_app: :microwaveprop
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alias PromEx.Plugins
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@impl true
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def plugins do
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[
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# Defaults: VM memory, process counts, scheduler util, app version.
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Plugins.Application,
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Plugins.Beam,
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# Phoenix: request duration by route/status, channel/socket events.
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{Plugins.Phoenix, router: MicrowavepropWeb.Router, endpoint: MicrowavepropWeb.Endpoint},
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# Ecto: query duration, queue time, pool size.
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{Plugins.Ecto, otp_app: :microwaveprop, repos: [Microwaveprop.Repo]},
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# Oban: job duration, queue time, state counts, queue depth.
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Plugins.Oban,
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# Our own spans: Instrument.span/3 emits [:microwaveprop | suffix]
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# events; this plugin converts them to Prometheus histograms.
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Microwaveprop.PromEx.InstrumentPlugin
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]
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end
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@impl true
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def dashboards do
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[
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{:prom_ex, "application.json"},
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{:prom_ex, "beam.json"},
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{:prom_ex, "phoenix.json"},
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{:prom_ex, "ecto.json"},
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{:prom_ex, "oban.json"}
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]
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end
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end
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