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https://issues.apache.org/jira/browse/AIRFLOW-4833?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16877967#comment-16877967
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Galak commented on AIRFLOW-4833:
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[~thenumenorean]: I agree with you, {{keep_trailing_newline}} should default to
{{True}}; but it defaults to {{False}} now, and can't be changed for backward
compatibility. See [https://github.com/pallets/jinja/issues/848] and
[https://github.com/pallets/jinja/issues/949]
I'll try to submit a PR for this in the coming weeks
> Jinja templating removes newlines
> ---------------------------------
>
> Key: AIRFLOW-4833
> URL: https://issues.apache.org/jira/browse/AIRFLOW-4833
> Project: Apache Airflow
> Issue Type: Bug
> Components: operators
> Affects Versions: 1.10.2
> Reporter: Francesco Macagno
> Priority: Minor
>
> When using an operator that has Jinja templating enabled for a field, if the
> field value ends with a newline then the newline is removed, regardless of
> whether there was a template in the string.
>
> This came up when attempting to send data to Prometheus pushgateway using the
> SimpleHttpOperator. Pushgateway requires a newline at the end of every entry,
> so the removal of the newline at the end of the data parameter causes the
> request to fail in a way that is difficult to debug.
>
> This can be gotten around by including a space after the newline character,
> though this is not a great solution. The space is ignored by pushgateway.
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