fix: improve memory metrics graph

backend/migrations/20250320081915_longer_variable_description.down.sql

@@ -0,0 +1 @@
+-- Add down migration script here

backend/migrations/20250320081915_longer_variable_description.up.sql

@@ -0,0 +1,3 @@
+-- Add up migration script here
+ALTER TABLE variable 
+ALTER COLUMN description TYPE VARCHAR(10000);

backend/windmill-common/src/job_metrics.rs

@@ -49,10 +49,7 @@ pub async fn register_metric_for_job(
     .await?
     .flatten();
     if exists.unwrap_or(false) {
-        return Err(error::Error::BadRequest(format!(
-            "Metric {} is already registered for job {}",
-            metric_id, job_id
-        )));
+        return Ok(metric_id);
     }
 
     let (scalar_int, scalar_float, timestamps, timeseries_int, timeseries_float) = match metric_kind

backend/windmill-worker/src/bash_executor.rs

@@ -341,7 +341,7 @@ async fn handle_docker_job(
                                 tracing::error!("Error getting logs: {:?}", e);
                             }
                             _ => {
-                                tracing::error!("End of stream");
+                                tracing::info!("End of docker logs stream");
                                 return
                             }
                         };