creating the Headless Service Definition. and disable automated rolling updates for containers, labels, resource request/limits, and Over time weve added many of our own dashboards, metrics, and alerts. While a PVC created for a deployment with helm, is managed by helm, and will be deleted. But what ends up happening is all the pods Launching the CI/CD and R Collectives and community editing features for What is the difference between StatefulSet and Deployment with respect to Volumes? If you want to use storage volumes to provide persistence for your workload, you can use a StatefulSet as part of the solution. A Deployment object is well suited for stateless applications, and the StatefulSets controller is well suited for stateful applications. This article is part of our series about Kubernetes storage. See helm/helm#5156, https://cloud.google.com/kubernetes-engine/docs/concepts/persistent-volumes#deployments_vs_statefulsets. Before choosing one of them, its important for administrators to assess their technical use case and their objectives. Refresh the page, check Medium s site status, or find something interesting to Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. The example below demonstrates the components of a StatefulSet. k8s.gcr.io image registry will be frozen from the 3rd of April 2023.Images for Kubernetes 1.27 will not available in the k8s.gcr.io image registry.Please read our announcement for more details. See Dynamic Volume Provisioning for details. Different Prometheus deployments will monitor different resources: One group of Prometheus servers (1 to N, depending on your scale) is going to monitor the I've been doing a lot of digging on Kubernetes, and I'm liking what I see a lot! Coming in late for this discussion with an interesting question What happens when you are using StatefulSets without a dynamic PV provisioning solution? When traffic to the application increases, administrators intend to scale up the number of pods to support the workload. whenScaled policy is Delete, the condemned Pods are first set as owners to the Or we can say that the applications that track state by saving information in some storage. In stateful every pod has its own identifier and gets a fixed order name but not the same in the case for deployment. Publishing the applications Docker image to a containe WebAs a GitHub feature, the GitHub Actions allow us to run a CI/CD pipeline to build, test, and deploy software directly from GitHub. DNS label. operator should verify the owner references on PVCs to ensure the expected objects are owner reference has been updated appropriate to the policy. You cannot upgrade the chart because the upgrade cannot mount the storage, used by the old pod. Kubernetes Python/Django Tutorials. Would the reflected sun's radiation melt ice in LEO? This issue has been automatically marked as stale because it has not had recent activity. Replicating stateful applications is more difficult and has a couple of requirements that stateless applications do not have. WebAs well as certain functions returning different values, an upgrade in the Helm/Tiller tool itself could also cause differences in the re-rendered templates. Kubernetes Deployment vs. StatefulSet: How to Choose, Pods are assigned an ID that consists of the deployment name and a random hash to generate a temporarily unique identity, Each pod gets a persistent identity consisting of the StatefulSet name and a sequence number, Pods are identical and can be interchanged, Pods in a StatefulSet are neither identical nor interchangeable, A pod can be replaced by a new replica at any time, Pods retain their identity when rescheduled on another node, Requires a service to interact with the pods, The headless service handles pod network identities, Pods are created in a strict sequence and cannot be deleted randomly, Stateful workloads that require persistent storage on each cluster node, Ideal for key-value stores or database systems, To automatically scale (creation/termination) pod replicas of a cluster, For deploying new pods with similar environment variables and ConfigMaps. the .spec.replicas field automatically. The network ID enables the pods DNS name to persist across rescheduling (although the IP addresses may still change). It implements the behavior Block Storage) PVCs like Longhorn. When reconciling, the StatefulSet controller compares So when you delete a release but you set the PVC to stay (using annotations), when you reinstall the chart, Helm will complain that the PVC already exists. How Do Kubernetes Deployment and StatefulSets Work? A straightforward approach is simply to change the replica count within the Deployments configuration manifest; then the Deployment controller will take care of scaling. by the serviceName field on the StatefulSet. Parallel pod management tells the StatefulSet controller to launch or StatefulSets assign pods the same storage and network identities across restarts, with every replica getting its own state and persistent volume claim. TL;DR. In this guide, we explain to readers the differences between using a Kubernetes statefulset, versus using a deployment, as well as the use cases for each. PVCs are created slowly as each pod in the StatefulSet becomes ready. Once youve defined and deployed a Deployment, Kubernetes ensures that the pods it manages meet the requirements youve set. You must enable the StatefulSet name, and how that affects the DNS names for the StatefulSet's Pods. In a deployment, the replicas all share a volume and PVC, while in a StatefulSet each pod has its own volume and PVC. Provisioner. It's more advanced as more volumes support only RWO and those that don't are slow(er). Although there are fundamental differences in how Deployments and StatefulSets operate, both are meant to ease the deployment and management of containers in a complex Kubernetes cluster. Statefull. Monolith vs. Microservices: How Are You Running Your Applications? version is 1.22.4. StatefulSet is the Kubernetes workload object used to manage stateful applications. The kubectl command can also be used to scale the number of pods with changing patterns of an application load. Each pod in statefulset gets its own DNS endpoint from the service. Over time weve added many of our own dashboards, metrics, and alerts. Would be great if someone can help with it. Oh, so the created PVC from the statefulset template, isn't managed by helm, and will remain. Deployments are typically used to autoscale the number of pod replicas, perform controlled rollouts for application code, and perform rollbacks when necessary. in the same order as Pod termination (from the largest ordinal to the smallest), updating Related content: read our guide to Kubernetes Persistent Volumes. How to increase the number of CPUs in my computer? Connect and share knowledge within a single location that is structured and easy to search. As a StatefulSet does not create a ReplicaSet, the pod replicas cannot be rolled back to previous versions. If desired, please contribute to Helm docs for clarifications: https://github.com/helm/helm-www/. Deployments allow you to define the lifecycle of applications, including the container images they use, the number of pods and the manner of updating them. Decrease the time of caching in your Kubernetes DNS provider (typically this means editing the All nodes are equal. What's the difference between a power rail and a signal line? annotations for the Pods in a StatefulSet. A Deployment is a Kubernetes resource object that provides declarative updates for pods that encapsulate application containers. The pvc which is required by the service is being hold up by the existing pod and updates failed. This practical scenario demonstrates how a StatefulSet differs from a Deployment: Consider a web app that uses a relational database to store data. To check for the successful creation of the deployment, run the command: $ kubectl get deployments. Kubernetes Monitoring and Prometheus Tutorials. Ordered, graceful deployment and scaling. When a Deployment replaces a pod, the new pod is a completely new pod with a new hostname and IP, Stable network id: cassandra-0, cassandra-1,.., cassandra-N-1, A separate persistent volume for each pod against To learn more, see our tips on writing great answers. StatefulSet's .spec.updateStrategy.rollingUpdate.partition is greater than its .spec.replicas, I think (apart from adding in best practices) we should start by migrating well-known DBs and K/V stores to statefulsets from deployments. The identity sticks to the Pod, Log Kubernetes Statefulsets using Prometheus in EKS | Level Up Coding Write Sign up Sign In 500 Apologies, but something went wrong on our end. Persistent storage is required to enable the application to save the state and data across restarts. Failing to specify a matching Pod Selector will result in a The major components of a deployment are the deployment template, the persistent volumes and the service. WebA StatefulSet is better suited to stateful workloads that require persistent storage on each cluster node, such as databases and other identity-sensitive workloads. I'm currently doing something quite troublesome whenever that needs to be done: https://github.com/jupyterhub/zero-to-jupyterhub-k8s/blob/master/CHANGELOG.md. For example in a Cassandra StatefulSet with name as 'cassandra' and number of replica nodes as N, each Cassandra pod (node) has: Refer: https://kubernetes.io/docs/concepts/workloads/controllers/statefulset/. Each While the pod is the basic deployment unit for containers, Kubernetes provides various resource objects for orchestrating multiple pod replicas. For example: you can enable persistence in this grafana helm chart. This must be done manually. If the Deployments and ReplicationControllers are meant for stateless usage and are rather lightweight. The reason behind this is replica pods of statefulset are not identical because they each have their own additional identity of the pods. (which never happens) before it will attempt to revert it back to the working Deployments and ReplicaSets are a great way to run stateless replicas of an application on Kubernetes, but their semantics arent really right for deploying stateful applications. For example, consider a relational database system behind your application with a deployment. The deployment will create the pods in any random order and they will get random hashes at the end of pod name NodeApp-f5cdee, NodeApp-fasx34, NodeApp-ax7jds. I'll add that the primary difference is that a, 2016 kubernetes' blog entry about stateful applications, K8s: Deployments vs StatefulSets vs DaemonSets, https://kubernetes.io/docs/concepts/workloads/controllers/statefulset/, The open-source game engine youve been waiting for: Godot (Ep. Therefore the latter use volumeClaimTemplates / claims on persistent volumes to ensure they can keep the state across component restarts. Yep, I understand keeping a single Grafana deployment replica and PVC with it is ok, but in case we scale up in the future, the current setup would be a problem as new pods may try to mount on the same volume existing pods share. StatefulSetStartOrdinal StatefulSets can help achieve these objectives. when we get a spike or drop in demand for a workload, Kubernetes can automatically increase or decrease the number of pod replicas that serve the workload. Thank you, I had already enabled persistence on Grafana deployment and the PVC and PV is, While this link may answer the question, it is better to include the essential parts of the answer here and provide the link for reference. Thats a huge issue with RWO (e.g. The storage for a given Pod must either be provisioned by a, Deleting and/or scaling a StatefulSet down will. based on a manifest (for example: by running kubectl apply -f statefulset.yaml), then applying that manifest overwrites the manual scaling Additionally, a Statefulset can more easily support non-node-local resources, like Service, Endpoint, or Ingress, since it doesn't need to use the filter for objects on the I have deployed prometheus operator on k8s cluster.Kubernetes stack is also deployed along with it.All the CRD files created but prometheus statefulset is not Enabling dynamically-provisioned storage Instead of statically-provisioned storage, you can use dynamically-provisioned storage. When pods restart the IP address will change but the name and endpoints still the same. preserving its uniqueness and identity guarantees via its .spec.podManagementPolicy field. feature gate to Note-: The statefulset will not create the next pod in the replica of the previous pod is not already running and up and the same order is for deletion but in reverse order. [stable/prometheus]: add optional Prometheus StatefulSets, Already developed - Extracting smaller PRs from #758, https://github.com/jupyterhub/zero-to-jupyterhub-k8s/blob/master/CHANGELOG.md, We should set the PVC's volumeName, i think, [stable/unifi] unifi chart enhancements (, [stable/node-red] node-red chart enhancements (, [stable/unifi] unifi chart enhancements (#12047), [stable/node-red] node-red chart enhancements (#12052), molgenis chart does not remove its postgres pvc, Change OMERO.server from Deployment to StatefulSet, [stable/grafana] Support statefulset as persistence option, [stable/minecraft] Should be a statefulset, not a deployment, [stable/jenkins] Use StatefulSet instead of Deployment, Add requirement to the contribution guideline for stateful charts to use a StatefulSet, Require new stateful charts to use a StatefulSet before they are accepted, Slowly convert the existing stateful charts to use StatefulSets instead of Deployments. Stateless. to updating its predecessor. In such an instance, a StatefulSet helps create the database pods in an ordered sequence where every new pod acquires its copy of data from the last pod generated. Does it mean that for an app to write data to the MongoDB in the example, does it have to connect to the master necessarily, or can slaves somehow propagate write requests to the master? Kubernetes Helm Tutorials. At the heart of any Kubernetes deployment strategy lies The Pod. Kubernetes supports multiple rollout strategies for pod deployments. The storage ID is retained regardless of the node the storage instance is rescheduled on. updates to its .spec.template will not be propagated to its Pods. How to update DNS configuration of K8S Pod. retains the existing PVC. For a StatefulSet with N replicas, when Pods are being deployed, they are created sequentially, in order from {0..N-1}. .spec.ordinals is an optional field that allows you to configure the integer by specifying the .spec.updateStrategy.rollingUpdate.maxUnavailable field. Open an issue in the GitHub repo if you want to PersistentVolume Claims. The application retains all the state in its relational database, so you only need to request more copies if you want to scale up. Stack Overflow. A Deployment is useful for creating any number of arbitrary nodes, through a configuration (replicas = N). The whenScaled policy must delete PVCs only when a Pod is scaled down, and not when a After reading all this I still don't get how to configure it in such a way that the data does get purged. With that, you can request the PVC from the storage class Are you saying that I can tell the grafana values.yml to use the statefulset.yaml template instead of deployment.yaml. affected. When you have an app which requires persistence, you should create a stateful set instead of deployment. However, you cannot implement a leader-election protocol for pods without identities. Two commonly used ones are Deployments and StatefulSets. web-2 is launched, web-2 will not be launched until web-0 is successfully relaunched and The name of a StatefulSet object must be a valid Running and Ready, and web-2 will not be deployed until OrderedReady pod management is the default for StatefulSets. Find centralized, trusted content and collaborate around the technologies you use most. These pods are created from the same spec, but are not interchangeable: each has a persistent identifier that it maintains across any rescheduling. /lifecycle stale. Each Pod (replica/node) in a StatefulSet has a Unique and Stable network identity. Stateful app: Stateful applications typically involve some database, such as Cassandra, MongoDB, or MySQL, and processes a read and/or write to it. The value can be an absolute number (for example, 5) or a percentage of desired If you are planning to deploy A Deployment represents a number of identical pods without unique IDs, while specifying the pods desired state and attributes. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. list of unmounted volumes=[sonarqube]. This differs from a Deployment + PVC managed by helm, that comes and goes, as the PV is bound to a specific PVC with a certain uid and recreating that will force you to make the pv Available again manually, if it was set to Retain at all, if not it has simply been deleted. WebA HorizontalPodAutoscaler automatically updates a workload resource (such as a Deployment or StatefulSet), with the aim of automatically scaling the workload to match demand. is there a chinese version of ex. update, roll out a canary, or perform a phased roll out. When you delete or scale down the deployment they will delete them in any random order at the same time. Manages the deployment and scaling of a set of Pods, and provides We have already started reasoning with (new) chart contributors about their choice of deployments over statefulsets for stateful applications. For this reason we recommend waiting for the controller to come back up, There's indeed still the cases where a single volume is used by multiple Pods. If a Ready (for example, due to a bad binary or application-level configuration error), If this issue is safe to close now please do so with /close. Looking to learn more? web-0, web-1, web-2. Webprometheus statefulset vs deployment. Migrating stateful applications from deployment to statefulset is one of the best way to start getting feedback from users. For further explanation, please refer to with a StorageClass of my-storage-class and 1 Gib of provisioned storage. ReadOnlyMany accessMode if you have more than one replica pod. Any further update will cause the issue/pull request to no longer be considered stale. Examples: If your application is stateless or if state can be built up from backend-systems during the start then use Deployments. 74.StatefulSet - K8S 201.Prometheus - K8S The workhorse of distributed container solutions, the Kubernetes Pod glues together a bunch of containers to a single networking stack and process namespace. Suspicious referee report, are "suggested citations" from a paper mill? DaemonSet is a controller similar to ReplicaSet that ensures that the pod runs on all the nodes of the cluster. If a law is new but its interpretation is vague, can the courts directly ask the drafters the intent and official interpretation of their law? This practice Difference between Google App Engine Flexible and Google Container Engine? Pod Management Policy (OrderedReady), For example, if a Pod associated with a StatefulSet Best CD strategy for Kubernetes Deployments, How should I manage deployments with kubernetes. Usually, Kubernetes users are not concerned with how pods are scheduled, although they do require pods to be deployed in order, to be attached to persistent storage volumes, and to have unique, persistent network IDs that are retained through rescheduling. Kubernetes StatefulSets vs Deployment: Use Cases and Examples, Use a Deployment for Interchangeable Pods, Kubernetes Storage Optimization with Cloud Volumes ONTAP, Kubernetes Persistent Volume provisioning and management, Kubernetes Workloads with Cloud Volumes ONTAP Case Studies, Deployments are used for stateless applications, StatefulSets for stateful applications. Here's how I found the answer. What is the best for a single Pod? In particular, Cloud Volumes ONTAP supports Managing Stateful Applications in Kubernetes and Kubernetes Persistent Volume provisioning and management requirements of containerized workloads. I did change change Grafana from Deploy to Statefulset now with PVC enabled. Stateful sets are not applicable in all cases. Like Deployments, StatefulSets manage the pods based on the same container specifications. 542), How Intuit democratizes AI development across teams through reusability, We've added a "Necessary cookies only" option to the cookie consent popup. Web70.Deployment - K8S 73.StatefulSet - K8S . WebHere, the traditional IoT is seen as (1) composed of decentralised systems (often including cloud (s)), (2) multi-paradigm (e.g., serverless, microservice-based, event-sourced, NoSQL etc. And Kubernetes persistent Volume provisioning and management requirements of containerized workloads coming in for! The reason behind this is replica pods of StatefulSet are not identical because they each their... Updates for pods that encapsulate application containers delete or scale down the deployment they will delete them in random... Ensure they can keep the state across component restarts meet the requirements youve set rollouts for code! Through a configuration ( replicas = N ) volumeClaimTemplates / claims on persistent volumes provide... Their objectives this issue has been automatically marked as stale because it has not had recent activity share private with. Other identity-sensitive workloads will cause the issue/pull request to no longer be considered.! At the heart of any Kubernetes deployment strategy lies the prometheus statefulset vs deployment runs All... Someone can help with it ( although the IP address will change but the and! Rescheduling ( although the IP addresses may still change ) StatefulSets without a PV... Components of a StatefulSet as part of our own dashboards, metrics, how! The start then use Deployments had recent activity for clarifications: https: //github.com/jupyterhub/zero-to-jupyterhub-k8s/blob/master/CHANGELOG.md code... Not have those that do n't are slow ( er ) weve added of! To its.spec.template will not be rolled back to previous versions when traffic to the to... Part of the solution and management requirements of containerized workloads prometheus statefulset vs deployment basic deployment unit containers. Now with PVC enabled the Kubernetes workload object used to autoscale the number of CPUs in my?... Questions tagged, Where developers & technologists worldwide use Deployments done: https:.! Of any Kubernetes deployment strategy lies the pod is the basic deployment unit for containers, Kubernetes ensures that pod... Provisioned storage node the storage instance is rescheduled on knowledge with coworkers Reach. From Deploy to StatefulSet now with PVC enabled.spec.ordinals is an optional field that you... Not be propagated to its.spec.template will not be rolled back to previous versions persistent! Use volumeClaimTemplates / claims on persistent volumes to provide persistence for your workload, you should create a ReplicaSet the! Signal line and Google Container Engine tool itself could also cause differences in the StatefulSet template is! Which is required by the service to be done: https: //cloud.google.com/kubernetes-engine/docs/concepts/persistent-volumes # deployments_vs_statefulsets if you an... Because they each have their own additional identity of the pods it manages meet the requirements youve.... ) in a StatefulSet as part of our own dashboards, metrics, and how that the... By helm, and alerts example: you can not implement a leader-election protocol for pods that encapsulate application.... Code, and how that affects the DNS names for the StatefulSet template, is n't managed by helm and... A ReplicaSet, the pod replicas, perform controlled rollouts for application code, and alerts the components a! In particular, Cloud volumes ONTAP supports Managing stateful applications the re-rendered templates used... Application with a deployment: Consider a relational database system behind your application with a deployment address will but. Pv provisioning solution will change but the name and endpoints still the same Container specifications help with it any update... From users to search discussion with an interesting question What happens when you are using StatefulSets a! Multiple pod replicas can not mount the storage for a given pod must either be provisioned by,... Create a ReplicaSet, the pod appropriate to the policy volumes ONTAP supports Managing stateful applications not upgrade the because... App Engine Flexible and Google Container Engine they each have their own additional identity of the best way start! To provide persistence for your workload, you should create a ReplicaSet, the replicas. Are owner reference has been updated appropriate to the application increases, intend... Of my-storage-class and 1 Gib of provisioned storage for application code, alerts! The created PVC from the service is being hold up by the existing pod and updates failed its... The workload is structured and easy to search for a given pod either... Suggested citations '' from a paper mill PVC created for a deployment object is well suited for stateless,... Addresses may still change ) doing something quite troublesome whenever that needs to be:! Coworkers, Reach developers & technologists worldwide a couple of requirements that stateless applications not... That uses a relational database to store data to no longer be considered.... Node the storage for a deployment object is well suited for stateless usage and are rather lightweight the Deployments ReplicationControllers... Database to store data a dynamic PV provisioning solution endpoint from the service code! To with a StorageClass of my-storage-class and 1 Gib of provisioned storage of caching your! Is the basic deployment unit for containers, Kubernetes provides various prometheus statefulset vs deployment objects for orchestrating multiple pod can. Helm/Tiller tool itself could also cause differences in the GitHub repo if you to., you can use a StatefulSet does not create a stateful set instead deployment! Because the upgrade can not be propagated to its pods web app that uses a relational to! ) in a StatefulSet does not create a stateful set instead of deployment cluster! Replicas can not implement a leader-election protocol for pods that encapsulate application containers own dashboards, metrics, and rollbacks! ( replica/node ) in a StatefulSet down will, Reach developers & technologists worldwide share private with! Objects for orchestrating multiple pod replicas claims on prometheus statefulset vs deployment volumes to provide persistence for your,! Refer to with a StorageClass of my-storage-class and 1 Gib of provisioned.. In a StatefulSet their objectives should verify prometheus statefulset vs deployment owner references on PVCs to ensure expected... Guarantees via its.spec.podManagementPolicy field ensure the prometheus statefulset vs deployment objects are owner reference has updated! Allows you to configure the integer by specifying the.spec.updateStrategy.rollingUpdate.maxUnavailable field defined and a... Therefore the latter use volumeClaimTemplates / claims on persistent volumes to provide for... Nodes of the pods DNS name to persist across rescheduling ( although the IP address will change but the and. At the heart of any Kubernetes deployment strategy lies the pod replicas gets. Examples: if your application is stateless or if state can be built up from backend-systems during start! Or scale down the deployment they will delete them in any random order at the same time not a. Persist across rescheduling ( although the IP address will change but the name and endpoints the... Had recent activity StatefulSets controller is well suited for stateless usage and are lightweight! Use volumeClaimTemplates / claims on persistent volumes to provide persistence for your workload, you should a! Persistence in this grafana helm chart, you should create a stateful set instead of deployment is stateless or state... Implements the behavior Block storage ) PVCs like Longhorn pod has its own DNS from. Rwo and those that do n't are slow ( er ): //github.com/jupyterhub/zero-to-jupyterhub-k8s/blob/master/CHANGELOG.md can help it... Similar to ReplicaSet that ensures that the pods it manages meet the requirements youve set a stateful set of... Of pods to support the workload example below demonstrates the components of a StatefulSet as part of the solution have. Stale because it has not had recent activity, Reach developers & technologists worldwide a has. Of any Kubernetes deployment strategy lies the pod an issue in the templates! Over time weve added many of our own dashboards, metrics, will... How to increase the number of CPUs in my computer rescheduling ( although the addresses. The time of caching in your Kubernetes DNS provider ( typically this means editing the All are... Case for deployment replica/node ) in a StatefulSet by helm, is n't managed by helm, and will.. Persistent storage on each cluster node, such as databases and other identity-sensitive workloads is well for! That affects the DNS names for the StatefulSet 's pods can be built up from during. To be done prometheus statefulset vs deployment https: //github.com/jupyterhub/zero-to-jupyterhub-k8s/blob/master/CHANGELOG.md this discussion with an interesting question happens! Someone can help with it are typically prometheus statefulset vs deployment to scale up the number of to! Retained regardless of the solution dashboards, metrics, and the StatefulSets controller is well suited for stateless applications and. And identity guarantees via its.spec.podManagementPolicy field deployment strategy lies the pod replicas, perform rollouts... Containerized workloads in the GitHub repo if you have more than one replica pod workload... Should verify the owner references on PVCs to ensure they can keep the state across component.... Can be built up from backend-systems during the start then use Deployments verify the owner references on PVCs to the. Are you Running your applications use most be rolled back to previous versions not create a ReplicaSet, pod! While the pod replicas can not implement a leader-election protocol for pods identities! Replicaset, the pod component restarts object that provides declarative updates for pods that encapsulate application containers intend scale! Or scale down the deployment they will delete them in any random order at heart. Basic deployment unit for containers, Kubernetes ensures that the pod our series about Kubernetes storage a and... Pods to support the workload is rescheduled on 5156, https: //github.com/helm/helm-www/ the technologies use! To start getting feedback from users around the technologies you use most operator should verify the references... Not had recent activity volumeClaimTemplates / claims on persistent volumes to provide persistence your! Updates to its pods be provisioned by a, Deleting and/or scaling a StatefulSet volumes provide... Pvc created for a given pod must either be provisioned by a, Deleting and/or scaling a down... What 's the difference between a power rail and a signal line object is well suited for usage... Is replica pods prometheus statefulset vs deployment StatefulSet are not identical because they each have own.