Add Vercel Monitor skeleton code.

src/adapters/monitors/mod.rs

@@ -60,3 +60,4 @@ pub trait Monitor: Shutdownable {
 
 mod cloudflare;
 mod cloudwatch;
+mod vercel;

src/adapters/monitors/vercel.rs

@@ -0,0 +1,57 @@
+#![allow(dead_code)]
+// This code won't be dead once we incorporate it into the flow.
+
+use async_trait::async_trait;
+use derive_getters::Getters;
+
+use crate::{
+    Shutdownable, adapters::backend::MonitorConfig, metrics::ResponseStatusCode,
+    stats::CategoricalObservation, subsystems::ShutdownResult,
+};
+use miette::Result;
+
+use super::Monitor;
+
+type VercelClient = ();
+
+#[derive(Getters)]
+pub struct Vercel {
+    client: VercelClient,
+}
+
+impl Vercel {
+    pub fn new(client: VercelClient) -> Self {
+        Self { client }
+    }
+}
+
+#[async_trait]
+impl Monitor for Vercel {
+    type Item = CategoricalObservation<5, ResponseStatusCode>;
+
+    fn get_config(&self) -> MonitorConfig {
+        todo!();
+    }
+
+    async fn query(&mut self) -> Result<Vec<Self::Item>> {
+        todo!();
+    }
+
+    async fn set_canary_version_id(&mut self, canary_version_id: String) -> Result<()> {
+        let _ = canary_version_id;
+        todo!();
+    }
+
+    // TODO: standardize naming to baseline when working outside of statistics packages
+    async fn set_baseline_version_id(&mut self, baseline_version_id: String) -> Result<()> {
+        let _ = baseline_version_id;
+        todo!();
+    }
+}
+
+#[async_trait]
+impl Shutdownable for Vercel {
+    async fn shutdown(&mut self) -> ShutdownResult {
+        todo!();
+    }
+}