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bca04bc2c3
Sharing one body between the Slack and email receivers made the email
unreadable. Email cannot render Slack markup, so the bold asterisks, the
backticks and the `🚨` shortcodes all arrived as literal
characters, and a `<url|label>` link could not become a link at all -- it dumped
the whole dashboard URL inline. Four panel links then buried the prose.
Split the body in two. The Slack body keeps mrkdwn. The email body is plain
text, one fact per line, with each dashboard link on its own labelled line.
Both still share the title and the node-identity fallback.
Measured while fixing this, and now recorded in templates.yaml: email escapes
any HTML in the message, so `<br>` arrives as `<br>` and no tag or anchor
is possible; but a newline in the template does become a real `<br>`, so line
breaks are the only layout tool email has.
Also correct two comments that were wrong. A missing template define does not
ship raw template text: it logs one warning and silently delivers Grafana's
default body, the value dump this file exists to remove, while the rule still
reports health=ok. And the Cloud contact point is not email-only; it holds a
Slack receiver and an email receiver, on an instance shared with other teams.