move client-cert gauges behind an otel feature of swarm-secret-client, drop the crate

swarm-review-classifier/Cargo.toml

@@ -25,12 +25,10 @@ opentelemetry-otlp.workspace = true
 serde.workspace = true
 serde_json.workspace = true
 # The try-out subject and the shapes the controller sends and reads back.
-# The `bao.client_cert.*` gauges on this exporter.
-swarm-cert-metrics.workspace = true
 swarm-queue-client.workspace = true
 swarm-wire.workspace = true
 # The API key and queue client secret paths, and the store login.
-swarm-secret-client.workspace = true
+swarm-secret-client = { workspace = true, features = ["otel"] }
 tokio.workspace = true
 tracing.workspace = true
 

swarm-review-classifier/src/cost.rs

@@ -171,7 +171,7 @@ fn build() -> Option<(SdkMeterProvider, Counters)> {
         .build();
     let provider = SdkMeterProvider::builder().with_reader(reader).build();
     let counters = counters(&provider);
-    swarm_cert_metrics::register(
+    swarm_secret_client::cert_metrics::register(
         &provider.meter("hyperhive.review_classifier"),
         "review-classifier",
     );