You can upgrade an existing Availability On-premise Vantage Point Worker, also known as Worker, on Kubernetes by updating the Helm Chart.

Here are the steps to be performed to upgrade the Worker on Kubernetes:

1. If you have not saved the original values file used during the initial Helm chart installation, you can retrieve the user-supplied values by running the following:

   helm get values <release-name> -n <namespace> -o yaml > /home/user/myvalues.yaml

   All values are now saved under /home/user/myvalues.yaml file.

2. Use the /home/user/myvalues.yaml file as an argument in the helm upgrade command, like the following: -f /home/user/myvalues.yaml
3. Use --set parameter for old and new values by running the following:

   helm upgrade --install --wait --namespace <namespace> --create-namespace <release-name> <helm_chart_path_new_version> [--set <previous_customized_value> ..] [--set <new_variables_value>]

4. Run the helm upgrade command to change LOG_LEVEL=DEBUG and pass previously used values along with the new or updated values.
   For example, see below the new values for WORKER_NAMES and LOG_LEVEL are passed along with the existing values:

   export PULLSECRET=`kubectl -n default get secret ocirsecret -o jsonpath='{.data.*}'`;
   
   helm upgrade --install --wait \
   --namespace opvp-ns --create-namespace \
   --set pvp.name=opvp-name \
   --set opvp.env.WORKER_NAMES="{worker-1,worker-2}"\
   --set image.repository=phx.ocir.io/axlxx1s82ggh/nhedau/opvp:1.2.8\
   --set image.pullSecret=$PULLSECRET \
   --set opvp.env.LOG_LEVEL=DEBUG \
   --set opvp.proxy.enabled=true\
   --set opvp.env.WORKER_PROXY_LOCATION=www-proxy.aa.bb.com:80\
   --set opvp.env.WORKER_PROXY_BYPASS_LIST=''\
   --set opvp.env.WORKER_PROXY_USER=''\
   --set opvp.env.WORKER_PROXY_PASS=''\
   --set opvp.env.WORKER_PROXY_TYPE=BASIC \
   --set opvp.env.APM_DOMAIN_OCID=ocid1.apmdomain.oc1.phx.aaa......rcq \
   --set opvp.env.OPVP_OCID=ocid1.apmsyntheticopvp.oc1.phx.aaa...tva \
   --set opvp.env.APM_DOMAIN_PRIVATE_DATA_KEY=4PU....RHK \
   --set opvp.env.SYN_API_SERVER=https://apm-synthetic.us-phoenix-1.oci.oraclecloud.com/ \
   --set opvp.env.AUTH_TYPE=oci_config \
   --set opvp.env.OCI_CONFIG_PROFILE=dev-phx \
   --set opvp.oci.config=/Users/ppp/Downloads/oci/config \
   --set opvp.oci.apiKey=/Users/ppp/Downloads/oci/oci-api-key.pem \
   --set nodeSelector.applications=synthetic-agent \
   --set nodeSelector.app=apm_synthetic \
   opvp-1.2.8 apm-synthetic-worker-helm-0.2.59/helm/.

   Note
   
   Do not pass --reuse-values to helm upgrade command because the default values in the new Helm chart version will get ignored which can result in templating errors and upgrade failures.