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Steps to run kubectl on your machine

Install google-cloud-cli. For staging <PROJECT_ID> is powr-staging and for production it's powr-prod.

Run command:

 gcloud config set project <PROJECT_ID>
 gcloud config set compute/region us-east1
 gcloud components update
 gcloud components install kubectl
 gcloud components install gke-gcloud-auth-plugin
 gcloud container clusters get-credentials main --region us-east1 --project powr-staging

This will create the configuration for kubectl and allow you to check current cluster status with kubectl get all -n main, where -n main stays for namespace. Result will look like:

NAME                                READY   STATUS      RESTARTS   AGE
pod/sidekiq-10min-27494820-bzqqj    0/3     Error       0          16h
pod/sidekiq-10min-27494820-mdp9x    0/3     Error       0          16h
pod/sidekiq-10min-27494820-pg6jf    0/3     Error       0          16h
pod/sidekiq-10min-27494820-rgslh    0/3     Error       0          16h
pod/sidekiq-10min-27494820-s57nc    0/3     Error       0          16h
pod/sidekiq-10min-27494820-x6gvq    0/3     Error       0          16h
pod/sidekiq-10min-27494820-zp6m7    0/3     Error       0          16h
pod/sidekiq-10min-27495790-nhpnq    0/3     Completed   0          28m
pod/sidekiq-10min-27495800-lfz4q    0/3     Completed   0          18m
pod/sidekiq-56f665b47b-m2k7m        1/1     Running     0          11m
pod/sidekiq-daily-27495620-6gcq6    0/1     Completed   0          3h18m
pod/sidekiq-hourly-27495678-vw82x   0/1     Completed   0          140m
pod/sidekiq-hourly-27495738-525rg   0/1     Completed   0          80m
pod/sidekiq-hourly-27495798-g7l8w   0/1     Completed   0          20m
pod/web-58d4567469-svqtg            0/1     Pending     0          10s
pod/web-5ff9c96f88-zvg9g            1/1     Running     0          11m

NAME          TYPE        CLUSTER-IP    EXTERNAL-IP   PORT(S)   AGE
service/web   ClusterIP   10.55.2.116   <none>        80/TCP    25h

NAME                      READY   UP-TO-DATE   AVAILABLE   AGE
deployment.apps/sidekiq   1/1     1            1           25h
deployment.apps/web       1/1     1            1           25h

NAME                                 DESIRED   CURRENT   READY   AGE
replicaset.apps/sidekiq-56f665b47b   1         1         1       20h
replicaset.apps/sidekiq-6975f65548   0         0         0       25h
replicaset.apps/web-575787f679       0         0         0       17h
replicaset.apps/web-586b4dd6f9       0         0         0       86m
replicaset.apps/web-58d4567469       1         1         0       12s
replicaset.apps/web-595c79cbd8       0         0         0       17h
replicaset.apps/web-5cc98c4ff9       0         0         0       11h
replicaset.apps/web-5ff9c96f88       1         1         1       20h
replicaset.apps/web-65d87f44bd       0         0         0       14h
replicaset.apps/web-6c6f8cfb75       0         0         0       44m
replicaset.apps/web-6d867f6d5        0         0         0       98m
replicaset.apps/web-7f6464b84        0         0         0       18h
replicaset.apps/web-b556595c8        0         0         0       13h
replicaset.apps/web-b78f55fbb        0         0         0       12h

NAME                                          REFERENCE            TARGETS           MINPODS   MAXPODS   REPLICAS   AGE
horizontalpodautoscaler.autoscaling/sidekiq   Deployment/sidekiq   9%/90%, 0%/90%    1         1         1          25h
horizontalpodautoscaler.autoscaling/web       Deployment/web       11%/90%, 0%/80%   1         1         1          25h

NAME                           SCHEDULE       SUSPEND   ACTIVE   LAST SCHEDULE   AGE
cronjob.batch/sidekiq-10min    */10 * * * *   False     0        8m38s           25h
cronjob.batch/sidekiq-daily    20 04 * * *    False     0        3h18m           25h
cronjob.batch/sidekiq-hourly   18 * * * *     False     0        20m             25h

NAME                                COMPLETIONS   DURATION   AGE
job.batch/sidekiq-10min-27494820    0/1           16h        16h
job.batch/sidekiq-10min-27495790    1/1           34s        28m
job.batch/sidekiq-10min-27495800    1/1           32s        18m
job.batch/sidekiq-10min-27495810    1/1           2m46s      8m39s
job.batch/sidekiq-daily-27495620    1/1           32s        3h18m
job.batch/sidekiq-hourly-27495678   1/1           33s        140m
job.batch/sidekiq-hourly-27495738   1/1           35s        80m
job.batch/sidekiq-hourly-27495798   1/1           29s        20m

Where web is rails application, sidekiq is a queue manager with async jobs and

sidekiq-10min/hourly/daily are cronjobs (same as schedulers on heroku). We also have service/web that is responsible for routing traffic from pods to ingress. Two types of autoscalers that are manager through helm and set of cronjobs (schedulers).

If you want to set main as your default namespace then run:

 kubectl config get-contexts $(kubectl config current-context)
 kubectl config set-context [NAME] [--cluster=cluster_nickname] [--namespace=namespace]
 kubectl config use-context [NAME]

$Set [NAME] to whatever you want.

Additional info could be found here.