[Fleet] Fix missing space in agent policy reassignment activity message

[Copilot]

Agent activity flyout displayed "Reassigning agentto Agent policy X" when reassigning agents, missing a space between "agent" and "to".

Changes

• helpers.tsx: Added leading space to reassignText template literal to match existing upgradeText pattern
• index.test.tsx: Added test coverage for in-progress policy reassignment message formatting

Code Change

// Before
reassignText: action.type === 'POLICY_REASSIGN' && action.newPolicyId ? `to ${action.newPolicyId}` : '',

// After  
reassignText: action.type === 'POLICY_REASSIGN' && action.newPolicyId ? ` to ${action.newPolicyId}` : '',

The message template concatenates variables without spacing, so each conditional variable must include its own leading punctuation. This follows the pattern already used by upgradeText which includes to version ${version}.

Result: "Reassigning 1 agent to Policy1" ✓

Original prompt

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This section details on the original issue you should resolve

<issue_title>[Fleet]: Space is missing in message under Agent activity for Assign to new policy action.</issue_title>
<issue_description>Kibana Build details:

VERSION: 9.3.0-SNAPSHOT
BUILD: 92454
COMMIT: e5f9c58ac8d24a090762509163ef1dcac9e56462

Preconditions:

1. 9.3.0-SNAPSHOT Kibana cloud environment should be available.
2. A few agents should be installed

Steps to reproduce:

1. Navigate to Fleet>Agents.
2. Assign agent to new policy.
3. Observe message under Agent activity:

• Reassigning agentto Agent policy 1

Note:

• The issue is more noticeable if Assigning to new policy action takes longer time.

Expected Result:
Appropriate space should be added in message under Agent activity for Assign to new policy action.

Screen Capture:

Comments on the Issue (you are @copilot in this section)

@elasticmachine Pinging @elastic/fleet (Team:Fleet) @amolnater-qasource **Suggestion to address the issue:** **Version:** Copilot- GPT-4.1

Steps to fix the issue:

1. Identify the source of the message:

   • Search for the string or function in the Fleet plugin responsible for logging or displaying agent policy assignment activities.
   • Likely files will be in the Fleet plugin directory:
     x-pack/plugins/fleet/

2. Find the message code:

   • Search for code that generates the activity message, especially for agent reassignment.
   • Example search patterns:
     • "Reassigning agentto"
     • Reassigning agent
     • "Assign agent"
   • If not hardcoded, look for template strings or functions handling agent events.

3. Modify the message string:

   • Update the string to include the missing space:
     Change from:

     `Reassigning agentto Agent policy ${policyName}`

     To:

     `Reassigning agent to Agent policy ${policyName}`

   • If concatenating strings, ensure a space is added between "agent" and "to".

Likely filenames to modify:

• Message generation (backend):
  x-pack/plugins/fleet/server/services/agent_policy.ts
  or
  x-pack/plugins/fleet/server/services/agent_service.ts
  or
  x-pack/plugins/fleet/server/services/activity_service.ts
• UI display (frontend):
  x-pack/plugins/fleet/public/applications/fleet/sections/agents/components/agent_activity_log.tsx
  or
  x-pack/plugins/fleet/public/applications/fleet/components/agent_policy_reassign.tsx

Example code change:

Suppose you find this in agent_activity_log.tsx:

// Before
const message = `Reassigning agentto Agent policy ${policyName}`;

// After
const message = `Reassigning agent to Agent policy ${policyName}`;

or if strings are concatenated:

// Before
const message = 'Reassigning agent' + 'to Agent policy ' + policyName;

// After
const message = 'Reassigning agent ' + 'to Agent policy ' + policyName;

@amolnater-qasource @muskangulati-qasource Please review. @muskangulati-qasource Secondary review is Done for this ticket!

• Fixes [Fleet]: Space is missing in message under Agent activity for Assign to new policy action. #241223

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[jen-huang]

/ci

[jen-huang]

buildkite test this

[elasticmachine]

⏳ Build in-progress, with failures

• Buildkite Build
• Commit: 98f14ef

Failed CI Steps

• Jest Tests #3
• Jest Tests #3

Test Failures

• [job] [logs] Jest Tests #3 / AgentActivityFlyout should render agent activity for in progress policy reassign
• [job] [logs] Jest Tests #3 / AgentActivityFlyout should render agent activity for in progress policy reassign

cc @jen-huang @copilot