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feat: Timestamp for Health Status (#16972) #18660

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merged 14 commits into from
Dec 6, 2024

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mkieweg
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@mkieweg mkieweg commented Jun 14, 2024

This PR contains an implementation of the enhancement proposal #16972.
Closes #16972

Checklist:

  • Either (a) I've created an enhancement proposal and discussed it with the community, (b) this is a bug fix, or (c) this does not need to be in the release notes.
  • The title of the PR states what changed and the related issues number (used for the release note).
  • The title of the PR conforms to the Toolchain Guide
  • I've included "Closes [ISSUE #]" or "Fixes [ISSUE #]" in the description to automatically close the associated issue.
  • I've updated both the CLI and UI to expose my feature, or I plan to submit a second PR with them.
  • Does this PR require documentation updates?
  • I've updated documentation as required by this PR.
  • I have signed off all my commits as required by DCO
  • I have written unit and/or e2e tests for my change. PRs without these are unlikely to be merged.
  • My build is green (troubleshooting builds).
  • My new feature complies with the feature status guidelines.
  • I have added a brief description of why this PR is necessary and/or what this PR solves.
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@mkieweg mkieweg requested a review from a team as a code owner June 14, 2024 10:52
@mkieweg mkieweg marked this pull request as draft June 14, 2024 10:59
@mkieweg mkieweg force-pushed the status-transition-time branch from 11944ca to 6d65cda Compare June 14, 2024 13:33
@mkieweg mkieweg marked this pull request as ready for review June 17, 2024 10:23
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Thanks! I have a couple of initial things, PTAL :)

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Thanks @mkieweg for the PR. I have left a suggestion. I think below section also needs an update.

if orig.Status.Health.Status != newStatus.Health.Status {
message := fmt.Sprintf("Updated health status: %s -> %s", orig.Status.Health.Status, newStatus.Health.Status)
ctrl.logAppEvent(orig, argo.EventInfo{Reason: argo.EventReasonResourceUpdated, Type: v1.EventTypeNormal}, message, context.TODO())
}
var newAnnotations map[string]string
if orig.GetAnnotations() != nil {
newAnnotations = make(map[string]string)
for k, v := range orig.GetAnnotations() {
newAnnotations[k] = v
}
delete(newAnnotations, appv1.AnnotationKeyRefresh)
}
patch, modified, err := diff.CreateTwoWayMergePatch(
&appv1.Application{ObjectMeta: metav1.ObjectMeta{Annotations: orig.GetAnnotations()}, Status: orig.Status},
&appv1.Application{ObjectMeta: metav1.ObjectMeta{Annotations: newAnnotations}, Status: *newStatus}, appv1.Application{})

Looks like CreateTwoWayMergePatch will always detect a drift here due to the new timestamp field and try to patch the status when there is no actual change in app health status. We might need to explicitly set it to old/orig value if there is not change in app health status. Update: not required.

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mkieweg commented Jun 19, 2024

Thanks @mkieweg for the PR. I have left a suggestion. I think below section also needs an update.

if orig.Status.Health.Status != newStatus.Health.Status {
message := fmt.Sprintf("Updated health status: %s -> %s", orig.Status.Health.Status, newStatus.Health.Status)
ctrl.logAppEvent(orig, argo.EventInfo{Reason: argo.EventReasonResourceUpdated, Type: v1.EventTypeNormal}, message, context.TODO())
}
var newAnnotations map[string]string
if orig.GetAnnotations() != nil {
newAnnotations = make(map[string]string)
for k, v := range orig.GetAnnotations() {
newAnnotations[k] = v
}
delete(newAnnotations, appv1.AnnotationKeyRefresh)
}
patch, modified, err := diff.CreateTwoWayMergePatch(
&appv1.Application{ObjectMeta: metav1.ObjectMeta{Annotations: orig.GetAnnotations()}, Status: orig.Status},
&appv1.Application{ObjectMeta: metav1.ObjectMeta{Annotations: newAnnotations}, Status: *newStatus}, appv1.Application{})

Looks like CreateTwoWayMergePatch will always detect a drift here due to the new timestamp field and try to patch the status when there is no actual change in app health status. We might need to explicitly set it to old/orig value if there is not change in app health status.

Thanks for pointing that out, I'll give it a look

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svghadi commented Jun 19, 2024

Hi @mkieweg, I think you can ignore my previous suggestion regarding changes due to CreateTwoWayMergePatch in persistAppStatus func. When I looked at the code again, I see the values passed to persistAppStatus func are actually deep copy of each other

app := origApp.DeepCopy()

and will differ only when explicitly updated, which happens at 2 places. We need to ensure timestamp is updated at these places (looks like 2. is already handled in your change).

  1. app.Status.Health.Status = health.HealthStatusUnknown

  2. app.Status.Health = *compareResult.healthStatus

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mkieweg commented Jun 19, 2024

Hi @mkieweg, I think you can ignore my previous suggestion regarding changes due to CreateTwoWayMergePatch in persistAppStatus func. When I looked at the code again, I see the values passed to persistAppStatus func are actually deep copy of each other

app := origApp.DeepCopy()

and will differ only when explicitly updated, which happens at 2 places. We need to ensure timestamp is updated at these places (looks like 2. is already handled in your change).

1. https://github.com/argoproj/argo-cd/blob/029b5acd5462e153b72fe0f7b1c5fa38e311d05c/controller/appcontroller.go#L1545

2. https://github.com/argoproj/argo-cd/blob/029b5acd5462e153b72fe0f7b1c5fa38e311d05c/controller/appcontroller.go#L1634

Hi @svghadi, I've added setting the timestamp in case we set the health status to unknown. The second one is indeed already handled by CompareAppState

@mkieweg mkieweg requested review from jannfis and svghadi June 20, 2024 10:45
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jessesuen commented Jun 21, 2024

We actually used to have a timestamp, but the updating of the timestamp as part of every app reconciliation would cause a ton of K8s API server pressure. I need to find the PR that removed this, but this could actually cause a performance problem.

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I found the old issue. It is here: #1340

Basically, we used to update status.observedAt, but this update would cause immense pressure on K8s API.

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this could actually cause a performance problem.

I took a closer look at this implementation, and noticed that we don't needlessly update timestamps (as we did with the problematic status.observedAt field)

			// If the status didn't change, we don't want to update the timestamp
			if healthStatus.Status == statuses[i].Health.Status {
				now = lastTransitionTime
			}

So my performance concerns may be alleviated.

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In the E2E test TestNamespacedConfigMap the output for some reason has changed from my-map Synced configmap/my-map created to my-map Synced Healthy configmap/my-map created.

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I ran some tests and found some corner cases that need to be handled:

  1. Timestamp for individual resources is updated to Application's LastTransitionTime even when there is no change in the resource status.
  2. The timestamp for Application's health is not updated when the status changes from Non Healthy to Healthy state.

Comment on lines 66 to 71
// If the status didn't change, we don't want to update the timestamp
if healthStatus.Status == statuses[i].Health.Status {
now = lastTransitionTime
}

resHealth := appv1.HealthStatus{Status: healthStatus.Status, Message: healthStatus.Message, LastTransitionTime: now}
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This section sets health of individual resources of the application. If there is no status change, I feel it should be set to lastTransitionTime of that particular resource instead of setting it to application's lastTransitionTime, as the values may not necessarily be the same.

Suggested change
// If the status didn't change, we don't want to update the timestamp
if healthStatus.Status == statuses[i].Health.Status {
now = lastTransitionTime
}
resHealth := appv1.HealthStatus{Status: healthStatus.Status, Message: healthStatus.Message, LastTransitionTime: now}
// If the status didn't change, we don't want to update the timestamp
if healthStatus.Status == statuses[i].Health.Status {
now = statuses[i].Health.LastTransitionTime
}
resHealth := appv1.HealthStatus{Status: healthStatus.Status, Message: healthStatus.Message, LastTransitionTime: now}

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Let me have a look and get back to you on this. I vaguely remember, that the current implementation only persists the timestamp on an application level. So while setting it on the resource level here might make sense, but I'm not sure if it has any benefit if the rest of the implementation remains unchanged. Which I would advocate for at the moment.

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I looked at the code. The resource-level timestamp is indeed difficult to achieve due to the current implementation.
Since the resource timestamp will contain the app health timestamp, I feel it may not be that useful. How about we skip it at the resource level? Just have it at the application health level, i.e. .status.health. If you change the timestamp to a pointer type, I think we can ignore it at resource level and it won't show up in .status.resources.

Comment on lines 89 to 95
if persistResourceHealth {
appHealth.LastTransitionTime = statuses[i].Health.LastTransitionTime
} else {
appHealth.LastTransitionTime = now
}
} else if healthStatus.Status == health.HealthStatusHealthy {
appHealth.LastTransitionTime = lastTransitionTime
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I think we need to handle case where status transition happens from Non Healthy -> Healthy. Since we have access to old status values, would it make sense to set the time value outside the for loop after the new status of application is calculated? Something like

diff --git a/controller/health.go b/controller/health.go
index b1c457776..e1a2c5d19 100644
--- a/controller/health.go
+++ b/controller/health.go
@@ -86,15 +86,11 @@ func setApplicationHealth(resources []managedResource, statuses []appv1.Resource
 
 		if health.IsWorse(appHealth.Status, healthStatus.Status) {
 			appHealth.Status = healthStatus.Status
-			if persistResourceHealth {
-				appHealth.LastTransitionTime = statuses[i].Health.LastTransitionTime
-			} else {
-				appHealth.LastTransitionTime = now
-			}
-		} else if healthStatus.Status == health.HealthStatusHealthy {
-			appHealth.LastTransitionTime = lastTransitionTime
 		}
 	}
+	if persistResourceHealth {
+          if app.Status.Health.Status == appHealth.Status {
+		  appHealth.LastTransitionTime = lastTransitionTime
+          } else {
+                 appHealth.LastTransitionTime = metav1.Now()
+          }
+	}
 	if persistResourceHealth {
 		app.Status.ResourceHealthSource = appv1.ResourceHealthLocationInline
 	} else {

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I've managed to repro the issue. Unfortunately it persists with your suggestion. I'll look into it deeper tomorrow

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I've added another test to appcontroller_test.go where the issue you're describing doesn't happen. I think the code works as expected, but maybe you can have another look :)

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I ran a manual test by creating a pod with delayed start. The time is updated for Missing->Progressing state change but it doesn't get updated when state moves from Progressing->Healthy.

timestamp-no-update.mov

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That's interesting. Let me have a closer look

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I've added some more extensive testing. Currently they break because I couldn't find a way to make them work with the way we're using mocks. Any suggestions on how to make TestUpdateHealthStatusProgression work are welcome

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I've managed to repro the issue. Unfortunately it persists with your suggestion.

Hmm, I haven't been able to repro this after applying @svghadi's suggestion.

kubectl get app guestbook -o jsonpath='{.status.health}'
{"lastTransitionTime":"2024-06-27T11:13:06Z","status":"Progressing"}
kubectl get app guestbook -o jsonpath='{.status.health}'
{"lastTransitionTime":"2024-06-27T11:13:31Z","status":"Healthy"}

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@mkieweg I added some changes which should fix your tests

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@hiddeco wrote in #16972 that this doesn't quite account for all edge cases.

While I am super supportive of this being added, I have an edge case that I think falls into this category but is not covered by just this addition.

Within Argo CD, the sync operations are completely separated from the application health. However, in certain scenarios, you do want to know if the current state of the health check is the outcome of a previous sync operation.

With the proposal, this would become possible by comparing the .finishedAt from the .status.operationState against the .lastUpdateTime. This, however, only works when you sync workload resources, which means that it will not help in scenarios where you only have non-workload resources, which will always end up Healthy without causing a transition.
...
I wonder if it would be an idea to introduce a "heartbeat" kind of timestamp that updates at most every 30 seconds (to not cause any API pressure) to indicate the "freshness" of the observation even without it transitioning.

By modifying @svghadi's suggestion slightly I think that would be achievable by doing this (haven't tested this so caveat emptor):

diff --git a/controller/health.go b/controller/health.go
index b1c457776..e1a2c5d19 100644
--- a/controller/health.go
+++ b/controller/health.go
@@ -86,15 +86,11 @@ func setApplicationHealth(resources []managedResource, statuses []appv1.Resource
 
 		if health.IsWorse(appHealth.Status, healthStatus.Status) {
 			appHealth.Status = healthStatus.Status
-			if persistResourceHealth {
-				appHealth.LastTransitionTime = statuses[i].Health.LastTransitionTime
-			} else {
-				appHealth.LastTransitionTime = now
-			}
-		} else if healthStatus.Status == health.HealthStatusHealthy {
-			appHealth.LastTransitionTime = lastTransitionTime
 		}
 	}

 	if persistResourceHealth {
+          if app.Status.Health.Status == appHealth.Status && time.Since(lastTransitionTime.Time) < 30*time.Second {
+		  appHealth.LastTransitionTime = lastTransitionTime
+          } else {
+                 appHealth.LastTransitionTime = metav1.Now()
+          }
 		app.Status.ResourceHealthSource = appv1.ResourceHealthLocationInline
 	} else {

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My suggestion however would be to have the heartbeat timestamp as a separate field (as e.g. "last observed" or "heartbeat"), as otherwise it could create a false impression that a transition did take place.

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svghadi commented Sep 3, 2024

Hi @mkieweg, did you get a chance to work on this again? If you're busy with other tasks, I'm happy to jump in and continue with it.

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mkieweg commented Sep 3, 2024

Hi @svghadi, sorry I had to pause working on this due to shifting priorities. I was planning on picking this back up this week. I'm not sure how much time I can actually commit, so if you're happy to take over that would be okay with me

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@svghadi I can also help out if needed

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svghadi commented Sep 3, 2024

@mkieweg - Sure. Could I get collaborator access to your argo-cd fork, or should I cherry-pick the changes and continue in a new PR?

@blakepettersson - Thank you. Should we address @hiddeco’s use case in this implementation, or would it be better to keep the scope limited and handle it in a separate PR?

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mkieweg commented Sep 3, 2024

@svghadi I've added you as a contributor to my fork. Can do the same for @blakepettersson if needed

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@blakepettersson - Thank you. Should we address @hiddeco’s use case in this implementation, or would it be better to keep the scope limited and handle it in a separate PR?

Ideally I'd like to see his use case addressed in this PR as well, since we have a particular use case in mind for it (it's related to Kargo).

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Can do the same for @blakepettersson if needed

Sounds good to me, thanks!

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svghadi commented Sep 4, 2024

Hi @blakepettersson , I was thinking about how to incorporate @hiddeco 's use case into this PR. It seems a bit challenging without introducing a new field, as @mkieweg's use case requires a timestamp that doesn't update periodically.

I propose to add a lastUpdateTime timestamp to app.status.health indicating how long the current status is active for.

In contrast, @hiddeco 's use case needs a periodically updating status timestamp.

introduce a "heartbeat" kind of timestamp that updates at most every 30 seconds (to not cause any API pressure) to indicate the "freshness" of the observation even without it transitioning.

Here are my thoughts:

  • Introduce a new observedAt field under application health, which updates periodically to indicate freshness.
  • Make this configurable to address @jessesuen 's concern about performance impact.

The health status would look something like this:

status:
  health:
    lastTransitionTime: "2024-09-03T08:51:32Z"
    observedAt: "2024-09-03T08:51:32Z"   # configurable 
    status: Progressing

Thoughts/suggestions?

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blakepettersson commented Sep 4, 2024

Hi @svghadi,

I agree that we'll need two separate fields, one for the health status and one to indicate "freshness".

Introduce a new observedAt field under application health, which updates periodically to indicate freshness.

👍

Make this configurable to address @jessesuen 's concern about performance impact.

I think it's fine for now to keep it at max 30 secs - if there is a need to configure this at a later stage we can address that in another PR.

@svghadi svghadi force-pushed the status-transition-time branch from e62a31f to 1036899 Compare September 9, 2024 11:36
@svghadi svghadi force-pushed the status-transition-time branch from b4fd9fa to eb80af0 Compare November 3, 2024 04:31
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svghadi commented Nov 3, 2024

Hi @blakepettersson, @crenshaw-dev, I have removed the concerning ObservedAt field changes from this PR. Can you do a fresh review? I will create a separate PR with ObservedAt field changes to address @hiddeco use-case post merge of this PR.

hs.status = "Degraded"
end
end
end
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Why do we need to override statuses?

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Also, you can use a modernized way of specifying healthchecks (not that it matters here), e.g. https://argo-cd.readthedocs.io/en/latest/operator-manual/health/#argocd-app

for _, tc := range testCases {
t.Run(tc.name, func(t *testing.T) {
deployment.SetLabels(map[string]string{"status": tc.initialStatus})
ctrl.processAppRefreshQueueItem()
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Why do we have to trigger it manually instead of requesting app refresh?

@svghadi svghadi force-pushed the status-transition-time branch from eb80af0 to f2e069b Compare December 2, 2024 05:20
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The PR looks great overall! I ran some tests on my end, and everything seems to be working smoothly. I have left some minor nits.

@@ -1631,8 +1631,10 @@ func (ctrl *ApplicationController) processAppRefreshQueueItem() (processNext boo
project, hasErrors := ctrl.refreshAppConditions(app)
ts.AddCheckpoint("refresh_app_conditions_ms")
if hasErrors {
now := metav1.Now()
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nit: We seem to be defining now := metav1.Now() at multiple places in the function. I do not think there would be a huge time difference in both the timestamps. Can we define at just 1 place before this if call or after ts.AddCheckpoint("refresh_app_conditions_ms") statement?

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Moved it out of if

@@ -1617,6 +1617,8 @@ type HealthStatus struct {
Status health.HealthStatusCode `json:"status,omitempty" protobuf:"bytes,1,opt,name=status"`
// Message is a human-readable informational message describing the health status
Message string `json:"message,omitempty" protobuf:"bytes,2,opt,name=message"`
// LastTransitionTime is the time the HealthStatus was set
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Suggested change
// LastTransitionTime is the time the HealthStatus was set
// LastTransitionTime is the time the HealthStatus was set or updated

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Done

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The PR needs rebase and make codegen again.

mkieweg and others added 13 commits December 6, 2024 15:45
Signed-off-by: Manuel Kieweg <mail@manuelkieweg.de>
Signed-off-by: Manuel Kieweg <mail@manuelkieweg.de>
Signed-off-by: Manuel Kieweg <mail@manuelkieweg.de>
Signed-off-by: Manuel Kieweg <mail@manuelkieweg.de>
Signed-off-by: Manuel Kieweg <mail@manuelkieweg.de>
Signed-off-by: Manuel Kieweg <mail@manuelkieweg.de>
Signed-off-by: Manuel Kieweg <mail@manuelkieweg.de>
Co-authored-by: Blake Pettersson <blake.pettersson@gmail.com>
Signed-off-by: Manuel Kieweg <2939765+mkieweg@users.noreply.github.com>
Signed-off-by: Manuel Kieweg <mail@manuelkieweg.de>
Signed-off-by: Manuel Kieweg <mail@manuelkieweg.de>
Due to implementation limitations, setting LastTransitionTime at the resource level is challenging.
Converting it to a pointer type allows it to be skipped at the resource level and prevents it from appearing
in .status.resources of the Application CR. Additionally, it doesn’t provide much value or have a known
use case right now.

Signed-off-by: Siddhesh Ghadi <sghadi1203@gmail.com>
Signed-off-by: Siddhesh Ghadi <sghadi1203@gmail.com>
Signed-off-by: Siddhesh Ghadi <sghadi1203@gmail.com>
@svghadi svghadi force-pushed the status-transition-time branch from f2e069b to 5b48033 Compare December 6, 2024 10:20
Signed-off-by: Siddhesh Ghadi <sghadi1203@gmail.com>
@ishitasequeira ishitasequeira merged commit 8f0d3d0 into argoproj:master Dec 6, 2024
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@blakepettersson
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Great job @svghadi!!

Do you mind creating a PR for the ObservedAt field as well?

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svghadi commented Dec 6, 2024

Thanks.
Sure. It has some rebase conflicts. Will get that out in few days.

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svghadi commented Dec 10, 2024

Hi @blakepettersson , the new PR (#21120) is up for observedAt field.

@svghadi svghadi deleted the status-transition-time branch December 10, 2024 15:47
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Add Timestamps to Health Status
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