How to Add Labels to Pods in Kubernetes Using the Go-client?

Adding Labels to Pods Using the Kubernetes Go-Client

Challenge:
Extend a Kubernetes program to add labels to existing Pods using the go-client.

Solution:
To add labels to Pods using the go-client, consider the following steps:

1. Import Necessary Modules:

   <code class="go">import (
       "encoding/json"
       "fmt"
       "time"
   
       metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
       "k8s.io/apimachinery/pkg/types"
   )</code>

2. Define a Patch Payload Structure:
   To construct the patch payload, define a custom struct to represent label value updates:

   <code class="go">type patchStringValue struct {
       Op    string `json:"op"`
       Path  string `json:"path"`
       Value string `json:"value"`
   }</code>

3. Populate the Patch Payload:
   Create a slice of patchStringValue objects to represent the specific label being added:

   <code class="go">payload := []patchStringValue{{
       Op:    "replace",
       Path:  "/metadata/labels/sent_alert_emailed",
       Value: time.Now().Format("2006-01-02_15.04.05"),
   }}</code>

4. Marshall the Patch Payload:
   Convert the payload slice into JSON format:

   <code class="go">payloadBytes, _ := json.Marshal(payload)</code>

5. Execute the Patch Operation:
   Using the Kubernetes client, execute the patch operation on the target Pod:

   <code class="go">_, updateErr = api.Pods(pod.GetNamespace()).Patch(
       pod.GetName(), types.JSONPatchType, payloadBytes,
   )</code>

   Check the value of updateErr to ensure the operation succeeded. If successful, output a success message.

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