sp-utils => sc-utils (#9677)

* sp-utils => sc-utils

* cargo fmt

* These files are now in the client so should be licensed as GPL3

* Apply suggestions from code review

Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>

substrate/client/utils/src/metrics.rs

@@ -0,0 +1,58 @@
+// This file is part of Substrate.
+
+// Copyright (C) 2020-2021 Parity Technologies (UK) Ltd.
+// SPDX-License-Identifier: GPL-3.0-or-later WITH Classpath-exception-2.0
+
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see <https://www.gnu.org/licenses/>.
+
+
+//! Metering primitives and globals
+
+use lazy_static::lazy_static;
+use prometheus::{
+	core::{AtomicU64, GenericCounter, GenericGauge},
+	Error as PrometheusError, Registry,
+};
+
+#[cfg(feature = "metered")]
+use prometheus::{core::GenericCounterVec, Opts};
+
+lazy_static! {
+	pub static ref TOKIO_THREADS_TOTAL: GenericCounter<AtomicU64> =
+		GenericCounter::new("tokio_threads_total", "Total number of threads created")
+			.expect("Creating of statics doesn't fail. qed");
+	pub static ref TOKIO_THREADS_ALIVE: GenericGauge<AtomicU64> =
+		GenericGauge::new("tokio_threads_alive", "Number of threads alive right now")
+			.expect("Creating of statics doesn't fail. qed");
+}
+
+#[cfg(feature = "metered")]
+lazy_static! {
+	pub static ref UNBOUNDED_CHANNELS_COUNTER : GenericCounterVec<AtomicU64> = GenericCounterVec::new(
+		Opts::new("unbounded_channel_len", "Items in each mpsc::unbounded instance"),
+		&["entity", "action"] // 'name of channel, send|received|dropped
+	).expect("Creating of statics doesn't fail. qed");
+
+}
+
+/// Register the statics to report to registry
+pub fn register_globals(registry: &Registry) -> Result<(), PrometheusError> {
+	registry.register(Box::new(TOKIO_THREADS_ALIVE.clone()))?;
+	registry.register(Box::new(TOKIO_THREADS_TOTAL.clone()))?;
+
+	#[cfg(feature = "metered")]
+	registry.register(Box::new(UNBOUNDED_CHANNELS_COUNTER.clone()))?;
+
+	Ok(())
+}