envoyproxy/envoy

feature request: add cluster intialization status to admin `/init_dump`

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#15,178 opened on Feb 24, 2021

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area/adminhelp wanted

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Description

We can now query the active cluster and warm cluster to know what clusters are able to use. It's adequate to explain why a request is "NR 503", but it's still hard to troubleshooting why a cluster stays warming up.

We can expose the per cluster init::manager to cluster manager and query init manager's unready target.

The followings are need to be resolved.

  1. The cluster ready details query should be exposed to admin interface /init_dump
  2. Not all the blocking items are under the frame of init::manager. If each of the blocking item attaches to a init::target with a meaningful name, the init status can be as simple as listing all the unready target names. The current cluster initialization does not end with init::manager announce "ready".

Thoughts?

Contributor guide

Research direction
Investigate how init::manager tracks cluster initialization and consider exposing unready target names via the admin `/init dump` endpoint. Ensure all blocking items attach to an init::target with a meaningful name.
Tech stack
cpp
Domain
backendapidevops
Issue type
Feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-2 days
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Mostly clear
Prerequisites
C++Envoy internalsAdmin API
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
50