[DataUsage][Serverless] Fix AutoOps error message to drop "agent" ref…

…erence (elastic#202996)

## Summary

This removes the references to "autoops agent" in the error message if
the request fails, as it has nothing to do with any agent.

### Checklist

Check the PR satisfies following conditions. 

Reviewers should verify this PR satisfies this list as well.

- [x] Any text added follows [EUI's writing
guidelines](https://elastic.github.io/eui/#/guidelines/writing), uses
sentence case text and includes [i18n
support](https://github.com/elastic/kibana/blob/main/packages/kbn-i18n/README.md)
- [x] This was checked for breaking HTTP API changes, and any breaking
changes have been approved by the breaking-change committee. The
`release_note:breaking` label should be applied in these situations.
- [x] The PR description includes the appropriate Release Notes section,
and the correct `release_note:*` label is applied per the
[guidelines](https://www.elastic.co/guide/en/kibana/master/contributing.html#kibana-release-notes-process)

### Identify risks

No. None of the error messages are exported, so they cannot be misused
in other places.

x-pack/plugins/data_usage/server/services/autoops_api.ts

@@ -24,8 +24,7 @@ import { AutoOpsConfig } from '../types';
 import { AutoOpsError } from './errors';
 import { appContextService } from './app_context';
 
-const AGENT_CREATION_FAILED_ERROR = 'AutoOps API could not create the autoops agent';
-const AUTO_OPS_AGENT_CREATION_PREFIX = '[AutoOps API] Creating autoops agent failed';
+const AUTO_OPS_REQUEST_FAILED_PREFIX = '[AutoOps API] Request failed';
 const AUTO_OPS_MISSING_CONFIG_ERROR = 'Missing autoops configuration';
 
 const getAutoOpsAPIRequestUrl = (url?: string, projectId?: string): string =>
@@ -120,7 +119,7 @@ export class AutoOpsAPIService {
       (error: Error | AxiosError) => {
         if (!axios.isAxiosError(error)) {
           this.logger.error(
-            `${AUTO_OPS_AGENT_CREATION_PREFIX} with an error ${error} ${requestConfigDebugStatus}`,
+            `${AUTO_OPS_REQUEST_FAILED_PREFIX} with an error ${error}, request config: ${requestConfigDebugStatus}`,
             errorMetadataWithRequestConfig
           );
           throw new AutoOpsError(withRequestIdMessage(error.message));
@@ -131,9 +130,11 @@ export class AutoOpsAPIService {
         if (error.response) {
           // The request was made and the server responded with a status code and error data
           this.logger.error(
-            `${AUTO_OPS_AGENT_CREATION_PREFIX} because the AutoOps API responded with a status code that falls out of the range of 2xx: ${JSON.stringify(
+            `${AUTO_OPS_REQUEST_FAILED_PREFIX} because the AutoOps API responded with a status code that falls out of the range of 2xx: ${JSON.stringify(
               error.response.status
-            )}} ${JSON.stringify(error.response.data)}} ${requestConfigDebugStatus}`,
+            )}} ${JSON.stringify(
+              error.response.data
+            )}}, request config: ${requestConfigDebugStatus}`,
             {
               ...errorMetadataWithRequestConfig,
               http: {
@@ -145,22 +146,22 @@ export class AutoOpsAPIService {
               },
             }
           );
-          throw new AutoOpsError(withRequestIdMessage(AGENT_CREATION_FAILED_ERROR));
+          throw new AutoOpsError(withRequestIdMessage(AUTO_OPS_REQUEST_FAILED_PREFIX));
         } else if (error.request) {
           // The request was made but no response was received
           this.logger.error(
-            `${AUTO_OPS_AGENT_CREATION_PREFIX} while sending the request to the AutoOps API: ${errorLogCodeCause} ${requestConfigDebugStatus}`,
+            `${AUTO_OPS_REQUEST_FAILED_PREFIX} while sending the request to the AutoOps API: ${errorLogCodeCause}, request config: ${requestConfigDebugStatus}`,
             errorMetadataWithRequestConfig
           );
           throw new AutoOpsError(withRequestIdMessage(`no response received from the AutoOps API`));
         } else {
           // Something happened in setting up the request that triggered an Error
           this.logger.error(
-            `${AUTO_OPS_AGENT_CREATION_PREFIX} to be created ${errorLogCodeCause} ${requestConfigDebugStatus} ${error.toJSON()}`,
+            `${AUTO_OPS_REQUEST_FAILED_PREFIX} with ${errorLogCodeCause}, request config: ${requestConfigDebugStatus}, error: ${error.toJSON()}`,
             errorMetadataWithRequestConfig
           );
           throw new AutoOpsError(
-            withRequestIdMessage(`${AGENT_CREATION_FAILED_ERROR}, ${error.message}`)
+            withRequestIdMessage(`${AUTO_OPS_REQUEST_FAILED_PREFIX}, ${error.message}`)
           );
         }
       }