chore(vrl): Remove deprecated metadata functions (#14821)

lib/vector-vrl-functions/src/lib.rs

@@ -1,23 +1,11 @@
 #![deny(warnings)]
 
-pub mod get_metadata_field;
 pub mod get_secret;
-pub mod remove_metadata_field;
 pub mod remove_secret;
-pub mod set_metadata_field;
 pub mod set_secret;
 pub mod set_semantic_meaning;
 
-use ::value::Value;
 use lookup::OwnedTargetPath;
-use vrl::prelude::*;
-
-pub(crate) fn legacy_keys() -> Vec<Value> {
-    LEGACY_METADATA_KEYS
-        .iter()
-        .map(|key| (*key).into())
-        .collect()
-}
 
 #[allow(clippy::large_enum_variant)]
 #[derive(Clone, Debug)]
@@ -30,31 +18,9 @@ pub const LEGACY_METADATA_KEYS: [&str; 2] = ["datadog_api_key", "splunk_hec_toke
 
 pub fn vrl_functions() -> Vec<Box<dyn vrl::Function>> {
     vec![
-        Box::new(get_metadata_field::GetMetadataField) as _,
-        Box::new(remove_metadata_field::RemoveMetadataField) as _,
-        Box::new(set_metadata_field::SetMetadataField) as _,
         Box::new(set_semantic_meaning::SetSemanticMeaning) as _,
         Box::new(get_secret::GetSecret) as _,
         Box::new(remove_secret::RemoveSecret) as _,
         Box::new(set_secret::SetSecret) as _,
     ]
 }
-
-fn get_metadata_key(
-    arguments: &mut ArgumentList,
-) -> std::result::Result<MetadataKey, Box<dyn DiagnosticMessage>> {
-    if let Ok(Some(query)) = arguments.optional_query("key") {
-        if let vrl::query::Target::External(_) = query.target() {
-            // for backwards compatibility reasons, the query is forced to point at metadata
-            let target_path = OwnedTargetPath::metadata(query.path().clone());
-            return Ok(MetadataKey::Query(target_path));
-        }
-    }
-
-    let key = arguments.required_enum("key", &legacy_keys())?;
-    Ok(MetadataKey::Legacy(
-        key.try_bytes_utf8_lossy()
-            .expect("key not bytes")
-            .to_string(),
-    ))
-}