To custom bot name and icon:
Step 1: Log in to JIRA Server as an administrator
Step 2: Choose Settings button at top right corner 
Step 3: At drop down menu, select System
Step 4: At the left hand side, scroll down until Slack Integration option > choose App setting
Step 5: Input Bot Name and copy image url to Bot Icon
Step 6: Click on 
button
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Create an Jira issue and log in Slack to view the changes |