fn flatten_into(message: &mut HashMap<String, Value>, name: &str, value: Value)Expand description
Writes value into message under name.
An object is flattened one level into <name>.<field> keys, because
context.message is a flat namespace: message_str does a plain
get(key) and {{message.a.b}} resolves the literal key "a.b" rather
than traversing. Anything else — scalar or array — is written under name
unchanged, so $msg_<name> keeps working for the counter case.
Only reachable from the redis-backed execute path (there is no value to
flatten without a store to have read it from), so this is
#[cfg(feature = "redis-store")] like the rest of that path.