Function serve_report 

pub fn serve_report(
    connection: &mut PgConnection,
    pool: &DbPool,
    corpus_name: String,
    service_name: String,
    severity: Option<String>,
    category: Option<String>,
    what: Option<String>,
    params: Option<ReportParams>,
    is_admin: bool,
) -> Result<Template, Status>

Prepare a configurable report for a <corpus,server> pair, reading over the caller-supplied (pooled) connection — no per-request fresh Backend::default(). 404 on unknown corpus/service.