fix: change MetricsPusher to also send tenant metrics

[edgurgel]

What kind of change does this PR introduce?

Also use Tasks to ensure that they drop the used memory after aggregating such metrics

[Copilot]

Pull request overview

Updates Realtime.MetricsPusher to push both global and tenant PromEx metrics on each interval, running each aggregation/push in its own supervised Task so memory can be reclaimed when the task exits.

Changes:

• Push global metrics (Realtime.PromEx.get_global_metrics/0) and tenant metrics (Realtime.TenantPromEx.get_metrics/0) concurrently via Task.Supervisor.async_nolink/2.
• Add timeout/exit handling for metrics push tasks and label global vs tenant failures in logs.
• Update MetricsPusherTest expectations to account for two push requests per interval and seed tenant telemetry.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 5 comments.

File	Description
lib/realtime/metrics_pusher.ex	Runs global + tenant metrics pushes in separate supervised tasks and adds labeled logging/error handling.
test/realtime/metrics_pusher_test.exs	Updates tests to expect two HTTP pushes and seeds tenant telemetry for tenant-metric generation.

Comments suppressed due to low confidence (1)

test/realtime/metrics_pusher_test.exs:104

• This test is named "sends request body untouched when compress=false", but it no longer asserts anything about the request body (only headers). Please assert that the raw body contains expected plaintext metrics (and is not gzip-compressed) for both requests so the test actually validates the non-compression behavior.

      Req.Test.expect(MetricsPusher, 2, fn conn ->
        assert Conn.get_req_header(conn, "content-encoding") == []
        assert Conn.get_req_header(conn, "content-type") == ["text/plain"]

        send(parent, :req_called)
        Req.Test.text(conn, "")
      end)

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