Send an email notification to the assignee and watchers of an issue when the reporter adds a comment.

// Get the reporter details as the issue property in the comment_created webhook only contains limited fields
def reporterDetails = get('/rest/api/2/issue/' + issue.key)
        .header('Content-Type', 'application/json')
        .asObject(Map)
        .body
        .fields
        .reporter

// Get the reporter accountId and displayName values
def reporterAccountId = reporterDetails.accountId
def reporterDisplayName = reporterDetails.displayName

// Get the commment authors accountId
def commentAuthorAccountId = comment.author.accountId

if (commentAuthorAccountId == reporterAccountId) {
    // Define the body of the notification using HTML to format it.
    def messageBody = "<p><b>${reporterDisplayName}</b> who is the reporter on the <b>${issue.key}</b> ticket has updated the issue.<p> <br/> <p> Please go and review the updates on the ticket.</p>"

    // Send the email notification
    def sendNotification = post("/rest/api/2/issue/${issue.key}/notify")
            .header("Content-Type", "application/json")
            .body([
                    subject : "The reporter has updated the ${issue.key} issue",
                    htmlBody: messageBody,
                    to      : [
                            assignee: issue.fields.assignee != null,
                            watchers: true,
                    ]
            ])
            .asString()

    assert sendNotification.status == 204
}