[oximeter] Add minimal versioning support (#4246)

Provides a mechanism to explicitly version Oximeter schema used within
Clickhouse, and to wipe that data
if any schema-breaking changes are made.

This is retroactively intended to solve the problems discussed within
#4221 , where the
`timeseries_key` generation was altered.

oximeter/collector/src/lib.rs

@@ -35,6 +35,7 @@ use omicron_common::backoff;
 use omicron_common::FileKv;
 use oximeter::types::ProducerResults;
 use oximeter::types::ProducerResultsItem;
+use oximeter_db::model::OXIMETER_VERSION;
 use oximeter_db::Client;
 use oximeter_db::DbWrite;
 use serde::Deserialize;
@@ -455,11 +456,7 @@ impl OximeterAgent {
         };
         let client = Client::new(db_address, &log);
         let replicated = client.is_oximeter_cluster().await?;
-        if !replicated {
-            client.init_single_node_db().await?;
-        } else {
-            client.init_replicated_db().await?;
-        }
+        client.initialize_db_with_version(replicated, OXIMETER_VERSION).await?;
 
         // Spawn the task for aggregating and inserting all metrics
         tokio::spawn(async move {