fix: Include CPU and memory limits in Fargate metadata

- Add FargateTaskLimits struct to capture CPU and memory from metadata endpoint
- Include task_cpu and task_memory fields in FargateAgentMetadata
- Update metadata conversion to pass resource limits to backend
- Remove Eq derive from structs containing f64 (CPU values)
- Fix pattern matches and tests to handle new fields

This fixes the profiler backend showing 'aws_fargate_0.0vcpu_0mb' instead
of actual resource allocation like 'aws_fargate_0.25vcpu_2048mb'.

Co-authored-by: Claude <claude@anthropic.com>

Author: rcoh

src/metadata/aws.rs

@@ -80,12 +80,22 @@ async fn read_ec2_metadata() -> Result<ImdsEc2InstanceMetadata, AwsProfilerMetad
     Ok(serde_json::from_str(imds_document.as_ref())?)
 }
 
-#[derive(Deserialize, Debug, PartialEq, Eq)]
+#[derive(Deserialize, Debug, PartialEq)]
+struct FargateTaskLimits {
+    #[serde(rename = "CPU")]
+    cpu: f64,
+    #[serde(rename = "Memory")]
+    memory: u64,
+}
+
+#[derive(Deserialize, Debug, PartialEq)]
 struct FargateMetadata {
     #[serde(rename = "Cluster")]
     cluster: String,
     #[serde(rename = "TaskARN")]
     task_arn: String,
+    #[serde(rename = "Limits")]
+    limits: FargateTaskLimits,
 }
 
 async fn read_fargate_metadata(
@@ -144,6 +154,8 @@ impl super::AgentMetadata {
                 .to_string(),
             ecs_task_arn: fargate_metadata.task_arn,
             ecs_cluster_arn: fargate_metadata.cluster,
+            task_cpu: fargate_metadata.limits.cpu,
+            task_memory: fargate_metadata.limits.memory,
         })
     }
 }
@@ -327,6 +339,10 @@ mod tests {
                 cluster: "arn:aws:ecs:us-east-1:123456789012:cluster/profiler-metadata-cluster"
                     .to_owned(),
                 task_arn: "arn:aws:ecs:us-east-1:123456789012:task/profiler-metadata-cluster/5261e761e0e2a3d92da3f02c8e5bab1f".to_owned(),
+                limits: FargateTaskLimits {
+                    cpu: 0.25,
+                    memory: 2048,
+                },
             }
         );
 
@@ -339,6 +355,8 @@ mod tests {
                 aws_region_id: "us-east-1".to_owned(),
                 ecs_task_arn: "arn:aws:ecs:us-east-1:123456789012:task/profiler-metadata-cluster/5261e761e0e2a3d92da3f02c8e5bab1f".to_owned(),
                 ecs_cluster_arn: "arn:aws:ecs:us-east-1:123456789012:cluster/profiler-metadata-cluster".to_owned(),
+                task_cpu: 0.25,
+                task_memory: 2048,
             }
         )
     }

src/metadata/mod.rs

@@ -7,7 +7,7 @@ pub use std::time::Duration;
 
 /// Host Metadata, which describes a host that runs a profiling agent. The current set of supported agent metadata is
 /// AWS-specific. If you are not running on AWS, you can use [AgentMetadata::NoMetadata].
-#[derive(Debug, Clone, PartialEq, Eq)]
+#[derive(Debug, Clone, PartialEq)]
 #[non_exhaustive]
 pub enum AgentMetadata {
     /// Metadata for an [EC2] instance running on AWS
@@ -41,6 +41,10 @@ pub enum AgentMetadata {
         ///
         /// See the ECS documentation for more details
         ecs_cluster_arn: String,
+        /// The task CPU allocation in vCPUs
+        task_cpu: f64,
+        /// The task memory allocation in MiB
+        task_memory: u64,
     },
     /// Metadata for a host that is neither an EC2 nor a Fargate
     #[deprecated = "Use AgentMetadata::NoMetadata"]
@@ -51,7 +55,7 @@ pub enum AgentMetadata {
 }
 
 /// Metadata associated with a specific individual profiling report
-#[derive(Debug, Clone, PartialEq, Eq)]
+#[derive(Debug, Clone, PartialEq)]
 pub struct ReportMetadata<'a> {
     /// The host running the agent
     pub instance: &'a AgentMetadata,

src/reporter/s3.rs

@@ -141,6 +141,7 @@ fn make_s3_file_name(
             aws_region_id: _,
             ecs_task_arn,
             ecs_cluster_arn: _,
+            ..
         } => {
             let task_arn = ecs_task_arn.replace("/", "-").replace("_", "-");
             format!("ecs_{task_arn}_")
@@ -265,7 +266,9 @@ mod test {
         aws_account_id: "1".into(),
         aws_region_id: "us-east-1".into(),
         ecs_task_arn: "arn:aws:ecs:us-east-1:123456789012:task/profiler-metadata-cluster/5261e761e0e2a3d92da3f02c8e5bab1f".into(),
-        ecs_cluster_arn: "arn:aws:ecs:us-east-1:123456789012:cluster/profiler-metadata-cluster".into()
+        ecs_cluster_arn: "arn:aws:ecs:us-east-1:123456789012:cluster/profiler-metadata-cluster".into(),
+        task_cpu: 0.25,
+        task_memory: 2048,
     }, "profile_pg_ecs_arn:aws:ecs:us-east-1:123456789012:task-profiler-metadata-cluster-5261e761e0e2a3d92da3f02c8e5bab1f__<pid>_<time>.zip"; "ecs")]
     fn test_make_s3_file_name(metadata: AgentMetadata, expected: &str) {
         let file_name = super::make_s3_file_name(&metadata, "pg", SystemTime::UNIX_EPOCH);