[BUG] Certain characters do not render correctly in message previews

[adamdepollo]

Describe the bug
Certain characters (i.e. slashes '/') do not render correctly when printed out to the Message preview in OpenSearch alert actions.

A clear and concise description of what the bug is.

To Reproduce
Steps to reproduce the behavior:

1. Generate a log with special characters in one of the log fields
2. Write an action message template to pull in the log field value
3. Click message preview
4. See error

Expected behavior
Characters should render correctly in the preview.

OpenSearch Version
2.11

Dashboards Version
2.11

Plugins

AWS-managed OpenSearch

Screenshots

Host/Environment (please complete the following information):

• OS: Windows
• Chrome Version 119.0.6045.200 (Official Build) (64-bit) and FireFox 120.0.1 64 bit

[manasvinibs]

Hi @adamdepollo
This seems to be an error coming from the Alerting plugin create Monitor template message component.
Hi @opensearch-project/admin Can you please transfer this to alerting-dashboard-plugin to look into the error?

[amsiglan]

@adamdepollo Looking at the Mustache documentation for variables by default all the values get HTML-escaped which might be causing the / to get converted to it's encoded value. To avoid that you can use {{{_source.val}}} (notice the extra curly braces. This way the value get printed as is.

I tried this locally and it works

with below document's message field /var/logs

{
    "_index": "test_agg",
    "_source": {
        "request.responseStatus": 200,
        "request.remoteAddress": "us-east-1",
        "message": "/var/logs",
        "request.id": 23,
        "timestamp": "2024-04-02T23:20:00Z"
    },
    "_id": "cqUjpo4BIlTtm2adX1Ah",
    "_score": 0
}

Closing this issue since there is no code change required here. Feel free to reopen if you think it needs more work