Change implementation totally to just use the metrics crate's macro directly

Signed-off-by: Ludvig Liljenberg <lliljenberg@microsoft.com>

Author: ludfjig

Justfile

@@ -89,13 +89,11 @@ test-rust target=default-target features="": (test-rust-int "rust" target featur
     # ignored tests - these tests need to run serially or with specific properties
     cargo test {{ if features =="" {''} else if features=="no-default-features" {"--no-default-features" } else {"--no-default-features -F " + features } }} --profile={{ if target == "debug" { "dev" } else { target } }} test_trace -p hyperlight-host --lib  -- --ignored
     cargo test {{ if features =="" {''} else if features=="no-default-features" {"--no-default-features" } else {"--no-default-features -F " + features } }} --profile={{ if target == "debug" { "dev" } else { target } }} test_drop  -p hyperlight-host --lib -- --ignored
-    cargo test {{ if features =="" {''} else if features=="no-default-features" {"--no-default-features" } else {"--no-default-features -F " + features } }} --profile={{ if target == "debug" { "dev" } else { target } }} hypervisor::metrics::tests::test_gather_metrics -p hyperlight-host --lib -- --ignored
-    cargo test {{ if features =="" {''} else if features=="no-default-features" {"--no-default-features" } else {"--no-default-features -F " + features } }} --profile={{ if target == "debug" { "dev" } else { target } }} sandbox::metrics::tests::test_gather_metrics -p hyperlight-host --lib -- --ignored
-    cargo test {{ if features =="" {''} else if features=="no-default-features" {"--no-default-features" } else {"--no-default-features -F " + features } }} --profile={{ if target == "debug" { "dev" } else { target } }} test_metrics -p hyperlight-host --lib -- --ignored
     cargo test {{ if features =="" {''} else if features=="no-default-features" {"--no-default-features" } else {"--no-default-features -F " + features } }} --profile={{ if target == "debug" { "dev" } else { target } }} --test integration_test log_message -- --ignored
     cargo test {{ if features =="" {''} else if features=="no-default-features" {"--no-default-features" } else {"--no-default-features -F " + features } }} --profile={{ if target == "debug" { "dev" } else { target } }} sandbox::uninitialized::tests::test_log_trace -p hyperlight-host --lib -- --ignored
     cargo test {{ if features =="" {''} else if features=="no-default-features" {"--no-default-features" } else {"--no-default-features -F " + features } }} --profile={{ if target == "debug" { "dev" } else { target } }} hypervisor::hypervisor_handler::tests::create_1000_sandboxes -p hyperlight-host --lib -- --ignored
-    cargo test {{ if features =="" {''} else if features=="no-default-features" {"--no-default-features" } else {"--no-default-features -F " + features } }} --profile={{ if target == "debug" { "dev" } else { target } }} metrics::tests::test_description_called_once -p hyperlight-host --lib -- --ignored
+    cargo test {{ if features =="" {''} else if features=="no-default-features" {"--no-default-features" } else {"--no-default-features -F " + features } }} --profile={{ if target == "debug" { "dev" } else { target } }} -p hyperlight-host --lib -- metrics::tests::test_metrics_are_emitted --exact --ignored
+    cargo test {{ if features =="" {''} else if features=="no-default-features" {"--no-default-features" } else {"--no-default-features -F function_call_metrics," + features } }} --profile={{ if target == "debug" { "dev" } else { target } }} -p hyperlight-host --lib -- metrics::tests::test_metrics_are_emitted --exact --ignored
     {{ set-trace-env-vars }} cargo test {{ if features =="" {''} else if features=="no-default-features" {"--no-default-features" } else {"--no-default-features -F " + features } }} --profile={{ if target == "debug" { "dev" } else { target } }} --lib sandbox::outb::tests::test_log_outb_log -- --ignored
 
 test-seccomp target=default-target features="":

src/hyperlight_host/src/func/guest_err.rs

@@ -18,7 +18,7 @@ use hyperlight_common::flatbuffer_wrappers::guest_error::ErrorCode;
 
 use crate::error::HyperlightError::{GuestError, OutBHandlingError, StackOverflow};
 use crate::mem::shared_mem::HostSharedMemory;
-use crate::metrics::{CounterMetric, EmittableMetric};
+use crate::metrics::{METRIC_GUEST_ERROR, METRIC_GUEST_ERROR_LABEL_CODE};
 use crate::sandbox::mem_mgr::MemMgrWrapper;
 use crate::{log_then_return, Result};
 /// Check for a guest error and return an `Err` if one was found,
@@ -29,7 +29,7 @@ pub(crate) fn check_for_guest_error(mgr: &MemMgrWrapper<HostSharedMemory>) -> Re
         ErrorCode::NoError => Ok(()),
         ErrorCode::OutbError => match mgr.as_ref().get_host_error()? {
             Some(host_err) => {
-                CounterMetric::guest_error(guest_err.code.into()).emit();
+                metrics::counter!(METRIC_GUEST_ERROR, METRIC_GUEST_ERROR_LABEL_CODE => (guest_err.code as u64).to_string()).increment(1);
 
                 log_then_return!(OutBHandlingError(
                     host_err.source.clone(),
@@ -40,11 +40,11 @@ pub(crate) fn check_for_guest_error(mgr: &MemMgrWrapper<HostSharedMemory>) -> Re
             None => Ok(()),
         },
         ErrorCode::StackOverflow => {
-            CounterMetric::guest_error(guest_err.code.into()).emit();
+            metrics::counter!(METRIC_GUEST_ERROR, METRIC_GUEST_ERROR_LABEL_CODE => (guest_err.code as u64).to_string()).increment(1);
             log_then_return!(StackOverflow());
         }
         _ => {
-            CounterMetric::guest_error(guest_err.code.into()).emit();
+            metrics::counter!(METRIC_GUEST_ERROR, METRIC_GUEST_ERROR_LABEL_CODE => (guest_err.code as u64).to_string()).increment(1);
             log_then_return!(GuestError(guest_err.code, guest_err.message.clone()));
         }
     }

src/hyperlight_host/src/hypervisor/hypervisor_handler.rs

@@ -48,7 +48,6 @@ use crate::mem::mgr::SandboxMemoryManager;
 use crate::mem::ptr::{GuestPtr, RawPtr};
 use crate::mem::ptr_offset::Offset;
 use crate::mem::shared_mem::{GuestSharedMemory, HostSharedMemory, SharedMemory};
-use crate::metrics::HistogramMetric;
 #[cfg(gdb)]
 use crate::sandbox::config::DebugInfo;
 use crate::sandbox::hypervisor::{get_available_hypervisor, HypervisorType};
@@ -434,7 +433,7 @@ impl HypervisorHandler {
                                     .lock
                                         .try_read();
 
-                                let res = HistogramMetric::time_and_emit_guest_call(
+                                let res = crate::metrics::time_and_emit_guest_call(
                                     &function_name,
                                     || {
                                         hv.dispatch_call_from_host(

src/hyperlight_host/src/hypervisor/mod.rs

@@ -19,7 +19,7 @@ use tracing::{instrument, Span};
 
 use crate::error::HyperlightError::ExecutionCanceledByHost;
 use crate::mem::memory_region::{MemoryRegion, MemoryRegionFlags};
-use crate::metrics::{CounterMetric, EmittableMetric};
+use crate::metrics::METRIC_GUEST_CANCELLATION;
 use crate::{log_then_return, new_error, HyperlightError, Result};
 
 /// Util for handling x87 fpu state
@@ -311,7 +311,7 @@ impl VirtualCPU {
                         #[cfg(target_os = "linux")]
                         hvh.set_run_cancelled(true);
                     }
-                    CounterMetric::guest_cancellation().emit();
+                    metrics::counter!(METRIC_GUEST_CANCELLATION).increment(1);
                     log_then_return!(ExecutionCanceledByHost());
                 }
                 Ok(HyperlightExit::Unknown(reason)) => {