[Custom threshold] Change the Custom threshold title to Beta (#172360)

Part of #171406

## Summary

This PR changes the Custom threshold title from `Technical Preview` to
`Beta`.

<img
src="https://github.com/elastic/kibana/assets/12370520/8a84ad54-b5f8-4989-a02d-5ab9c861945f"
width=500 />

|Before|After|
|---|---|

|![image](https://github.com/elastic/kibana/assets/12370520/b74bb18e-577c-42c5-90e4-610be7290884)|![image](https://github.com/elastic/kibana/assets/12370520/c69288ee-683f-48c1-a313-0519e368cd26)|

x-pack/plugins/observability/public/components/custom_threshold/mocks/custom_threshold_rule.ts

@@ -184,7 +184,7 @@ export const buildCustomThresholdAlert = (
         alertOnGroupDisappear: true,
       },
       'kibana.alert.evaluation.values': [2500, 5],
-      'kibana.alert.rule.category': 'Custom threshold (Technical Preview)',
+      'kibana.alert.rule.category': 'Custom threshold (Beta)',
       'kibana.alert.rule.consumer': 'alerts',
       'kibana.alert.rule.execution.uuid': '62dd07ef-ead9-4b1f-a415-7c83d03925f7',
       'kibana.alert.rule.name': 'One condition',

x-pack/plugins/observability/server/lib/rules/custom_threshold/register_custom_threshold_rule_type.ts

@@ -108,7 +108,7 @@ export function thresholdRuleType(
   return {
     id: OBSERVABILITY_THRESHOLD_RULE_TYPE_ID,
     name: i18n.translate('xpack.observability.threshold.ruleName', {
-      defaultMessage: 'Custom threshold (Technical Preview)',
+      defaultMessage: 'Custom threshold (Beta)',
     }),
     validate: {
       params: schema.object(

x-pack/test/alerting_api_integration/observability/custom_threshold_rule/avg_pct_fired.ts

@@ -157,7 +157,7 @@ export default function ({ getService }: FtrProviderContext) {
 
         expect(resp.hits.hits[0]._source).property(
           'kibana.alert.rule.category',
-          'Custom threshold (Technical Preview)'
+          'Custom threshold (Beta)'
         );
         expect(resp.hits.hits[0]._source).property('kibana.alert.rule.consumer', 'logs');
         expect(resp.hits.hits[0]._source).property('kibana.alert.rule.name', 'Threshold rule');

x-pack/test/alerting_api_integration/observability/custom_threshold_rule/avg_pct_no_data.ts

@@ -149,7 +149,7 @@ export default function ({ getService }: FtrProviderContext) {
 
         expect(resp.hits.hits[0]._source).property(
           'kibana.alert.rule.category',
-          'Custom threshold (Technical Preview)'
+          'Custom threshold (Beta)'
         );
         expect(resp.hits.hits[0]._source).property('kibana.alert.rule.consumer', 'logs');
         expect(resp.hits.hits[0]._source).property('kibana.alert.rule.name', 'Threshold rule');

x-pack/test/alerting_api_integration/observability/custom_threshold_rule/avg_us_fired.ts

@@ -163,7 +163,7 @@ export default function ({ getService }: FtrProviderContext) {
 
         expect(resp.hits.hits[0]._source).property(
           'kibana.alert.rule.category',
-          'Custom threshold (Technical Preview)'
+          'Custom threshold (Beta)'
         );
         expect(resp.hits.hits[0]._source).property('kibana.alert.rule.consumer', 'logs');
         expect(resp.hits.hits[0]._source).property('kibana.alert.rule.name', 'Threshold rule');

x-pack/test/alerting_api_integration/observability/custom_threshold_rule/custom_eq_avg_bytes_fired.ts

@@ -163,7 +163,7 @@ export default function ({ getService }: FtrProviderContext) {
 
         expect(resp.hits.hits[0]._source).property(
           'kibana.alert.rule.category',
-          'Custom threshold (Technical Preview)'
+          'Custom threshold (Beta)'
         );
         expect(resp.hits.hits[0]._source).property('kibana.alert.rule.consumer', 'logs');
         expect(resp.hits.hits[0]._source).property('kibana.alert.rule.name', 'Threshold rule');

x-pack/test/alerting_api_integration/observability/custom_threshold_rule/documents_count_fired.ts

@@ -154,7 +154,7 @@ export default function ({ getService }: FtrProviderContext) {
 
         expect(resp.hits.hits[0]._source).property(
           'kibana.alert.rule.category',
-          'Custom threshold (Technical Preview)'
+          'Custom threshold (Beta)'
         );
         expect(resp.hits.hits[0]._source).property('kibana.alert.rule.consumer', 'logs');
         expect(resp.hits.hits[0]._source).property('kibana.alert.rule.name', 'Threshold rule');

x-pack/test/alerting_api_integration/observability/custom_threshold_rule/group_by_fired.ts

@@ -158,7 +158,7 @@ export default function ({ getService }: FtrProviderContext) {
 
         expect(resp.hits.hits[0]._source).property(
           'kibana.alert.rule.category',
-          'Custom threshold (Technical Preview)'
+          'Custom threshold (Beta)'
         );
         expect(resp.hits.hits[0]._source).property('kibana.alert.rule.consumer', 'logs');
         expect(resp.hits.hits[0]._source).property('kibana.alert.rule.name', 'Threshold rule');

x-pack/test_serverless/api_integration/test_suites/observability/custom_threshold_rule/avg_pct_fired.ts

@@ -152,7 +152,7 @@ export default function ({ getService }: FtrProviderContext) {
 
         expect(resp.hits.hits[0]._source).property(
           'kibana.alert.rule.category',
-          'Custom threshold (Technical Preview)'
+          'Custom threshold (Beta)'
         );
         expect(resp.hits.hits[0]._source).property('kibana.alert.rule.consumer', 'observability');
         expect(resp.hits.hits[0]._source).property('kibana.alert.rule.name', 'Threshold rule');

x-pack/test_serverless/api_integration/test_suites/observability/custom_threshold_rule/avg_pct_no_data.ts

@@ -138,7 +138,7 @@ export default function ({ getService }: FtrProviderContext) {
 
         expect(resp.hits.hits[0]._source).property(
           'kibana.alert.rule.category',
-          'Custom threshold (Technical Preview)'
+          'Custom threshold (Beta)'
         );
         expect(resp.hits.hits[0]._source).property('kibana.alert.rule.consumer', 'observability');
         expect(resp.hits.hits[0]._source).property('kibana.alert.rule.name', 'Threshold rule');

x-pack/test_serverless/api_integration/test_suites/observability/custom_threshold_rule/custom_eq_avg_bytes_fired.ts

@@ -156,7 +156,7 @@ export default function ({ getService }: FtrProviderContext) {
 
         expect(resp.hits.hits[0]._source).property(
           'kibana.alert.rule.category',
-          'Custom threshold (Technical Preview)'
+          'Custom threshold (Beta)'
         );
         expect(resp.hits.hits[0]._source).property('kibana.alert.rule.consumer', 'observability');
         expect(resp.hits.hits[0]._source).property('kibana.alert.rule.name', 'Threshold rule');

x-pack/test_serverless/api_integration/test_suites/observability/custom_threshold_rule/documents_count_fired.ts

@@ -146,7 +146,7 @@ export default function ({ getService }: FtrProviderContext) {
 
         expect(resp.hits.hits[0]._source).property(
           'kibana.alert.rule.category',
-          'Custom threshold (Technical Preview)'
+          'Custom threshold (Beta)'
         );
         expect(resp.hits.hits[0]._source).property('kibana.alert.rule.consumer', 'observability');
         expect(resp.hits.hits[0]._source).property('kibana.alert.rule.name', 'Threshold rule');

x-pack/test_serverless/api_integration/test_suites/observability/custom_threshold_rule/group_by_fired.ts

@@ -165,7 +165,7 @@ export default function ({ getService }: FtrProviderContext) {
 
         expect(resp.hits.hits[0]._source).property(
           'kibana.alert.rule.category',
-          'Custom threshold (Technical Preview)'
+          'Custom threshold (Beta)'
         );
         expect(resp.hits.hits[0]._source).property('kibana.alert.rule.consumer', 'observability');
         expect(resp.hits.hits[0]._source).property('kibana.alert.rule.name', 'Threshold rule');