Line data Source code
1 : //! We re-export those from prometheus crate to
2 : //! make sure that we use the same dep version everywhere.
3 : //! Otherwise, we might not see all metrics registered via
4 : //! a default registry.
5 : #![deny(clippy::undocumented_unsafe_blocks)]
6 :
7 : use measured::{
8 : label::{LabelGroupSet, LabelGroupVisitor, LabelName, NoLabels},
9 : metric::{
10 : counter::CounterState,
11 : gauge::GaugeState,
12 : group::{Encoding, MetricValue},
13 : name::{MetricName, MetricNameEncoder},
14 : MetricEncoding, MetricFamilyEncoding,
15 : },
16 : FixedCardinalityLabel, LabelGroup, MetricGroup,
17 : };
18 : use once_cell::sync::Lazy;
19 : use prometheus::core::{
20 : Atomic, AtomicU64, Collector, GenericCounter, GenericCounterVec, GenericGauge, GenericGaugeVec,
21 : };
22 : pub use prometheus::opts;
23 : pub use prometheus::register;
24 : pub use prometheus::Error;
25 : use prometheus::Registry;
26 : pub use prometheus::{core, default_registry, proto};
27 : pub use prometheus::{exponential_buckets, linear_buckets};
28 : pub use prometheus::{register_counter_vec, Counter, CounterVec};
29 : pub use prometheus::{register_gauge, Gauge};
30 : pub use prometheus::{register_gauge_vec, GaugeVec};
31 : pub use prometheus::{register_histogram, Histogram};
32 : pub use prometheus::{register_histogram_vec, HistogramVec};
33 : pub use prometheus::{register_int_counter, IntCounter};
34 : pub use prometheus::{register_int_counter_vec, IntCounterVec};
35 : pub use prometheus::{register_int_gauge, IntGauge};
36 : pub use prometheus::{register_int_gauge_vec, IntGaugeVec};
37 : pub use prometheus::{Encoder, TextEncoder};
38 :
39 : pub mod launch_timestamp;
40 : mod wrappers;
41 : pub use wrappers::{CountedReader, CountedWriter};
42 : mod hll;
43 : pub use hll::{HyperLogLog, HyperLogLogState, HyperLogLogVec};
44 : #[cfg(target_os = "linux")]
45 : pub mod more_process_metrics;
46 :
47 : pub type UIntGauge = GenericGauge<AtomicU64>;
48 : pub type UIntGaugeVec = GenericGaugeVec<AtomicU64>;
49 :
50 : #[macro_export]
51 : macro_rules! register_uint_gauge_vec {
52 : ($NAME:expr, $HELP:expr, $LABELS_NAMES:expr $(,)?) => {{
53 : let gauge_vec = UIntGaugeVec::new($crate::opts!($NAME, $HELP), $LABELS_NAMES).unwrap();
54 785 : $crate::register(Box::new(gauge_vec.clone())).map(|_| gauge_vec)
55 : }};
56 : }
57 :
58 : #[macro_export]
59 : macro_rules! register_uint_gauge {
60 : ($NAME:expr, $HELP:expr $(,)?) => {{
61 : let gauge = $crate::UIntGauge::new($NAME, $HELP).unwrap();
62 481 : $crate::register(Box::new(gauge.clone())).map(|_| gauge)
63 : }};
64 : }
65 :
66 : /// Special internal registry, to collect metrics independently from the default registry.
67 : /// Was introduced to fix deadlock with lazy registration of metrics in the default registry.
68 : static INTERNAL_REGISTRY: Lazy<Registry> = Lazy::new(Registry::new);
69 :
70 : /// Register a collector in the internal registry. MUST be called before the first call to `gather()`.
71 : /// Otherwise, we can have a deadlock in the `gather()` call, trying to register a new collector
72 : /// while holding the lock.
73 0 : pub fn register_internal(c: Box<dyn Collector>) -> prometheus::Result<()> {
74 0 : INTERNAL_REGISTRY.register(c)
75 0 : }
76 :
77 : /// Gathers all Prometheus metrics and records the I/O stats just before that.
78 : ///
79 : /// Metrics gathering is a relatively simple and standalone operation, so
80 : /// it might be fine to do it this way to keep things simple.
81 0 : pub fn gather() -> Vec<prometheus::proto::MetricFamily> {
82 0 : update_rusage_metrics();
83 0 : let mut mfs = prometheus::gather();
84 0 : let mut internal_mfs = INTERNAL_REGISTRY.gather();
85 0 : mfs.append(&mut internal_mfs);
86 0 : mfs
87 0 : }
88 :
89 0 : static DISK_IO_BYTES: Lazy<IntGaugeVec> = Lazy::new(|| {
90 : register_int_gauge_vec!(
91 : "libmetrics_disk_io_bytes_total",
92 : "Bytes written and read from disk, grouped by the operation (read|write)",
93 : &["io_operation"]
94 : )
95 0 : .expect("Failed to register disk i/o bytes int gauge vec")
96 0 : });
97 :
98 0 : static MAXRSS_KB: Lazy<IntGauge> = Lazy::new(|| {
99 : register_int_gauge!(
100 : "libmetrics_maxrss_kb",
101 : "Memory usage (Maximum Resident Set Size)"
102 : )
103 0 : .expect("Failed to register maxrss_kb int gauge")
104 0 : });
105 :
106 : pub const DISK_WRITE_SECONDS_BUCKETS: &[f64] = &[
107 : 0.000_050, 0.000_100, 0.000_500, 0.001, 0.003, 0.005, 0.01, 0.05, 0.1, 0.3, 0.5,
108 : ];
109 :
110 : pub struct BuildInfo {
111 : pub revision: &'static str,
112 : pub build_tag: &'static str,
113 : }
114 :
115 : // todo: allow label group without the set
116 : impl LabelGroup for BuildInfo {
117 0 : fn visit_values(&self, v: &mut impl LabelGroupVisitor) {
118 0 : const REVISION: &LabelName = LabelName::from_str("revision");
119 0 : v.write_value(REVISION, &self.revision);
120 0 : const BUILD_TAG: &LabelName = LabelName::from_str("build_tag");
121 0 : v.write_value(BUILD_TAG, &self.build_tag);
122 0 : }
123 : }
124 :
125 : impl<T: Encoding> MetricFamilyEncoding<T> for BuildInfo
126 : where
127 : GaugeState: MetricEncoding<T>,
128 : {
129 0 : fn collect_family_into(
130 0 : &self,
131 0 : name: impl measured::metric::name::MetricNameEncoder,
132 0 : enc: &mut T,
133 0 : ) -> Result<(), T::Err> {
134 0 : enc.write_help(&name, "Build/version information")?;
135 0 : GaugeState::write_type(&name, enc)?;
136 0 : GaugeState {
137 0 : count: std::sync::atomic::AtomicI64::new(1),
138 0 : }
139 0 : .collect_into(&(), self, name, enc)
140 0 : }
141 : }
142 :
143 0 : #[derive(MetricGroup)]
144 : #[metric(new(build_info: BuildInfo))]
145 : pub struct NeonMetrics {
146 : #[cfg(target_os = "linux")]
147 : #[metric(namespace = "process")]
148 : #[metric(init = measured_process::ProcessCollector::for_self())]
149 : process: measured_process::ProcessCollector,
150 :
151 : #[metric(namespace = "libmetrics")]
152 : #[metric(init = LibMetrics::new(build_info))]
153 : libmetrics: LibMetrics,
154 : }
155 :
156 0 : #[derive(MetricGroup)]
157 : #[metric(new(build_info: BuildInfo))]
158 : pub struct LibMetrics {
159 : #[metric(init = build_info)]
160 : build_info: BuildInfo,
161 :
162 : #[metric(flatten)]
163 : rusage: Rusage,
164 :
165 : serve_count: CollectionCounter,
166 : }
167 :
168 0 : fn write_gauge<Enc: Encoding>(
169 0 : x: i64,
170 0 : labels: impl LabelGroup,
171 0 : name: impl MetricNameEncoder,
172 0 : enc: &mut Enc,
173 0 : ) -> Result<(), Enc::Err> {
174 0 : enc.write_metric_value(name, labels, MetricValue::Int(x))
175 0 : }
176 :
177 : #[derive(Default)]
178 : struct Rusage;
179 :
180 0 : #[derive(FixedCardinalityLabel, Clone, Copy)]
181 : #[label(singleton = "io_operation")]
182 : enum IoOp {
183 : Read,
184 : Write,
185 : }
186 :
187 : impl<T: Encoding> MetricGroup<T> for Rusage
188 : where
189 : GaugeState: MetricEncoding<T>,
190 : {
191 0 : fn collect_group_into(&self, enc: &mut T) -> Result<(), T::Err> {
192 0 : const DISK_IO: &MetricName = MetricName::from_str("disk_io_bytes_total");
193 0 : const MAXRSS: &MetricName = MetricName::from_str("maxrss_kb");
194 0 :
195 0 : let ru = get_rusage_stats();
196 0 :
197 0 : enc.write_help(
198 0 : DISK_IO,
199 0 : "Bytes written and read from disk, grouped by the operation (read|write)",
200 0 : )?;
201 0 : GaugeState::write_type(DISK_IO, enc)?;
202 0 : write_gauge(ru.ru_inblock * BYTES_IN_BLOCK, IoOp::Read, DISK_IO, enc)?;
203 0 : write_gauge(ru.ru_oublock * BYTES_IN_BLOCK, IoOp::Write, DISK_IO, enc)?;
204 :
205 0 : enc.write_help(MAXRSS, "Memory usage (Maximum Resident Set Size)")?;
206 0 : GaugeState::write_type(MAXRSS, enc)?;
207 0 : write_gauge(ru.ru_maxrss, IoOp::Read, MAXRSS, enc)?;
208 :
209 0 : Ok(())
210 0 : }
211 : }
212 :
213 : #[derive(Default)]
214 : struct CollectionCounter(CounterState);
215 :
216 : impl<T: Encoding> MetricFamilyEncoding<T> for CollectionCounter
217 : where
218 : CounterState: MetricEncoding<T>,
219 : {
220 0 : fn collect_family_into(
221 0 : &self,
222 0 : name: impl measured::metric::name::MetricNameEncoder,
223 0 : enc: &mut T,
224 0 : ) -> Result<(), T::Err> {
225 0 : self.0.inc();
226 0 : enc.write_help(&name, "Number of metric requests made")?;
227 0 : self.0.collect_into(&(), NoLabels, name, enc)
228 0 : }
229 : }
230 :
231 0 : pub fn set_build_info_metric(revision: &str, build_tag: &str) {
232 0 : let metric = register_int_gauge_vec!(
233 : "libmetrics_build_info",
234 : "Build/version information",
235 : &["revision", "build_tag"]
236 : )
237 0 : .expect("Failed to register build info metric");
238 0 : metric.with_label_values(&[revision, build_tag]).set(1);
239 0 : }
240 : const BYTES_IN_BLOCK: i64 = 512;
241 :
242 : // Records I/O stats in a "cross-platform" way.
243 : // Compiles both on macOS and Linux, but current macOS implementation always returns 0 as values for I/O stats.
244 : // An alternative is to read procfs (`/proc/[pid]/io`) which does not work under macOS at all, hence abandoned.
245 : //
246 : // Uses https://www.freebsd.org/cgi/man.cgi?query=getrusage to retrieve the number of block operations
247 : // performed by the process.
248 : // We know the size of the block, so we can determine the I/O bytes out of it.
249 : // The value might be not 100% exact, but should be fine for Prometheus metrics in this case.
250 0 : fn update_rusage_metrics() {
251 0 : let rusage_stats = get_rusage_stats();
252 0 :
253 0 : DISK_IO_BYTES
254 0 : .with_label_values(&["read"])
255 0 : .set(rusage_stats.ru_inblock * BYTES_IN_BLOCK);
256 0 : DISK_IO_BYTES
257 0 : .with_label_values(&["write"])
258 0 : .set(rusage_stats.ru_oublock * BYTES_IN_BLOCK);
259 0 :
260 0 : // On macOS, the unit of maxrss is bytes; on Linux, it's kilobytes. https://stackoverflow.com/a/59915669
261 0 : #[cfg(target_os = "macos")]
262 0 : {
263 0 : MAXRSS_KB.set(rusage_stats.ru_maxrss / 1024);
264 0 : }
265 0 : #[cfg(not(target_os = "macos"))]
266 0 : {
267 0 : MAXRSS_KB.set(rusage_stats.ru_maxrss);
268 0 : }
269 0 : }
270 :
271 0 : fn get_rusage_stats() -> libc::rusage {
272 0 : let mut rusage = std::mem::MaybeUninit::uninit();
273 0 :
274 0 : // SAFETY: kernel will initialize the struct for us
275 0 : unsafe {
276 0 : let ret = libc::getrusage(libc::RUSAGE_SELF, rusage.as_mut_ptr());
277 0 : assert!(ret == 0, "getrusage failed: bad args");
278 0 : rusage.assume_init()
279 0 : }
280 0 : }
281 :
282 : /// Create an [`IntCounterPairVec`] and registers to default registry.
283 : #[macro_export(local_inner_macros)]
284 : macro_rules! register_int_counter_pair_vec {
285 : ($NAME1:expr, $HELP1:expr, $NAME2:expr, $HELP2:expr, $LABELS_NAMES:expr $(,)?) => {{
286 : match (
287 : $crate::register_int_counter_vec!($NAME1, $HELP1, $LABELS_NAMES),
288 : $crate::register_int_counter_vec!($NAME2, $HELP2, $LABELS_NAMES),
289 : ) {
290 : (Ok(inc), Ok(dec)) => Ok($crate::IntCounterPairVec::new(inc, dec)),
291 : (Err(e), _) | (_, Err(e)) => Err(e),
292 : }
293 : }};
294 : }
295 :
296 : /// Create an [`IntCounterPair`] and registers to default registry.
297 : #[macro_export(local_inner_macros)]
298 : macro_rules! register_int_counter_pair {
299 : ($NAME1:expr, $HELP1:expr, $NAME2:expr, $HELP2:expr $(,)?) => {{
300 : match (
301 : $crate::register_int_counter!($NAME1, $HELP1),
302 : $crate::register_int_counter!($NAME2, $HELP2),
303 : ) {
304 : (Ok(inc), Ok(dec)) => Ok($crate::IntCounterPair::new(inc, dec)),
305 : (Err(e), _) | (_, Err(e)) => Err(e),
306 : }
307 : }};
308 : }
309 :
310 : /// A Pair of [`GenericCounterVec`]s. Like an [`GenericGaugeVec`] but will always observe changes
311 : pub struct GenericCounterPairVec<P: Atomic> {
312 : inc: GenericCounterVec<P>,
313 : dec: GenericCounterVec<P>,
314 : }
315 :
316 : /// A Pair of [`GenericCounter`]s. Like an [`GenericGauge`] but will always observe changes
317 : pub struct GenericCounterPair<P: Atomic> {
318 : inc: GenericCounter<P>,
319 : dec: GenericCounter<P>,
320 : }
321 :
322 : impl<P: Atomic> GenericCounterPairVec<P> {
323 157 : pub fn new(inc: GenericCounterVec<P>, dec: GenericCounterVec<P>) -> Self {
324 157 : Self { inc, dec }
325 157 : }
326 :
327 : /// `get_metric_with_label_values` returns the [`GenericCounterPair<P>`] for the given slice
328 : /// of label values (same order as the VariableLabels in Desc). If that combination of
329 : /// label values is accessed for the first time, a new [`GenericCounterPair<P>`] is created.
330 : ///
331 : /// An error is returned if the number of label values is not the same as the
332 : /// number of VariableLabels in Desc.
333 856 : pub fn get_metric_with_label_values(
334 856 : &self,
335 856 : vals: &[&str],
336 856 : ) -> prometheus::Result<GenericCounterPair<P>> {
337 856 : Ok(GenericCounterPair {
338 856 : inc: self.inc.get_metric_with_label_values(vals)?,
339 856 : dec: self.dec.get_metric_with_label_values(vals)?,
340 : })
341 856 : }
342 :
343 : /// `with_label_values` works as `get_metric_with_label_values`, but panics if an error
344 : /// occurs.
345 180 : pub fn with_label_values(&self, vals: &[&str]) -> GenericCounterPair<P> {
346 180 : self.get_metric_with_label_values(vals).unwrap()
347 180 : }
348 :
349 24 : pub fn remove_label_values(&self, res: &mut [prometheus::Result<()>; 2], vals: &[&str]) {
350 24 : res[0] = self.inc.remove_label_values(vals);
351 24 : res[1] = self.dec.remove_label_values(vals);
352 24 : }
353 : }
354 :
355 : impl<P: Atomic> GenericCounterPair<P> {
356 0 : pub fn new(inc: GenericCounter<P>, dec: GenericCounter<P>) -> Self {
357 0 : Self { inc, dec }
358 0 : }
359 :
360 : /// Increment the gauge by 1, returning a guard that decrements by 1 on drop.
361 364 : pub fn guard(&self) -> GenericCounterPairGuard<P> {
362 364 : self.inc.inc();
363 364 : GenericCounterPairGuard(self.dec.clone())
364 364 : }
365 :
366 : /// Increment the gauge by n, returning a guard that decrements by n on drop.
367 0 : pub fn guard_by(&self, n: P::T) -> GenericCounterPairGuardBy<P> {
368 0 : self.inc.inc_by(n);
369 0 : GenericCounterPairGuardBy(self.dec.clone(), n)
370 0 : }
371 :
372 : /// Increase the gauge by 1.
373 : #[inline]
374 3336 : pub fn inc(&self) {
375 3336 : self.inc.inc();
376 3336 : }
377 :
378 : /// Decrease the gauge by 1.
379 : #[inline]
380 2771 : pub fn dec(&self) {
381 2771 : self.dec.inc();
382 2771 : }
383 :
384 : /// Add the given value to the gauge. (The value can be
385 : /// negative, resulting in a decrement of the gauge.)
386 : #[inline]
387 0 : pub fn inc_by(&self, v: P::T) {
388 0 : self.inc.inc_by(v);
389 0 : }
390 :
391 : /// Subtract the given value from the gauge. (The value can be
392 : /// negative, resulting in an increment of the gauge.)
393 : #[inline]
394 0 : pub fn dec_by(&self, v: P::T) {
395 0 : self.dec.inc_by(v);
396 0 : }
397 : }
398 :
399 : impl<P: Atomic> Clone for GenericCounterPair<P> {
400 6081 : fn clone(&self) -> Self {
401 6081 : Self {
402 6081 : inc: self.inc.clone(),
403 6081 : dec: self.dec.clone(),
404 6081 : }
405 6081 : }
406 : }
407 :
408 : /// Guard returned by [`GenericCounterPair::guard`]
409 : pub struct GenericCounterPairGuard<P: Atomic>(GenericCounter<P>);
410 :
411 : impl<P: Atomic> Drop for GenericCounterPairGuard<P> {
412 364 : fn drop(&mut self) {
413 364 : self.0.inc();
414 364 : }
415 : }
416 : /// Guard returned by [`GenericCounterPair::guard_by`]
417 : pub struct GenericCounterPairGuardBy<P: Atomic>(GenericCounter<P>, P::T);
418 :
419 : impl<P: Atomic> Drop for GenericCounterPairGuardBy<P> {
420 0 : fn drop(&mut self) {
421 0 : self.0.inc_by(self.1);
422 0 : }
423 : }
424 :
425 : /// A Pair of [`IntCounterVec`]s. Like an [`IntGaugeVec`] but will always observe changes
426 : pub type IntCounterPairVec = GenericCounterPairVec<AtomicU64>;
427 :
428 : /// A Pair of [`IntCounter`]s. Like an [`IntGauge`] but will always observe changes
429 : pub type IntCounterPair = GenericCounterPair<AtomicU64>;
430 :
431 : /// A guard for [`IntCounterPair`] that will decrement the gauge on drop
432 : pub type IntCounterPairGuard = GenericCounterPairGuard<AtomicU64>;
433 :
434 : pub trait CounterPairAssoc {
435 : const INC_NAME: &'static MetricName;
436 : const DEC_NAME: &'static MetricName;
437 :
438 : const INC_HELP: &'static str;
439 : const DEC_HELP: &'static str;
440 :
441 : type LabelGroupSet: LabelGroupSet;
442 : }
443 :
444 : pub struct CounterPairVec<A: CounterPairAssoc> {
445 : vec: measured::metric::MetricVec<MeasuredCounterPairState, A::LabelGroupSet>,
446 : }
447 :
448 : impl<A: CounterPairAssoc> Default for CounterPairVec<A>
449 : where
450 : A::LabelGroupSet: Default,
451 : {
452 216 : fn default() -> Self {
453 216 : Self {
454 216 : vec: Default::default(),
455 216 : }
456 216 : }
457 : }
458 :
459 : impl<A: CounterPairAssoc> CounterPairVec<A> {
460 0 : pub fn guard(
461 0 : &self,
462 0 : labels: <A::LabelGroupSet as LabelGroupSet>::Group<'_>,
463 0 : ) -> MeasuredCounterPairGuard<'_, A> {
464 0 : let id = self.vec.with_labels(labels);
465 0 : self.vec.get_metric(id).inc.inc();
466 0 : MeasuredCounterPairGuard { vec: &self.vec, id }
467 0 : }
468 0 : pub fn inc(&self, labels: <A::LabelGroupSet as LabelGroupSet>::Group<'_>) {
469 0 : let id = self.vec.with_labels(labels);
470 0 : self.vec.get_metric(id).inc.inc();
471 0 : }
472 0 : pub fn dec(&self, labels: <A::LabelGroupSet as LabelGroupSet>::Group<'_>) {
473 0 : let id = self.vec.with_labels(labels);
474 0 : self.vec.get_metric(id).dec.inc();
475 0 : }
476 0 : pub fn remove_metric(
477 0 : &self,
478 0 : labels: <A::LabelGroupSet as LabelGroupSet>::Group<'_>,
479 0 : ) -> Option<MeasuredCounterPairState> {
480 0 : let id = self.vec.with_labels(labels);
481 0 : self.vec.remove_metric(id)
482 0 : }
483 :
484 0 : pub fn sample(&self, labels: <A::LabelGroupSet as LabelGroupSet>::Group<'_>) -> u64 {
485 0 : let id = self.vec.with_labels(labels);
486 0 : let metric = self.vec.get_metric(id);
487 0 :
488 0 : let inc = metric.inc.count.load(std::sync::atomic::Ordering::Relaxed);
489 0 : let dec = metric.dec.count.load(std::sync::atomic::Ordering::Relaxed);
490 0 : inc.saturating_sub(dec)
491 0 : }
492 : }
493 :
494 : impl<T, A> ::measured::metric::group::MetricGroup<T> for CounterPairVec<A>
495 : where
496 : T: ::measured::metric::group::Encoding,
497 : A: CounterPairAssoc,
498 : ::measured::metric::counter::CounterState: ::measured::metric::MetricEncoding<T>,
499 : {
500 0 : fn collect_group_into(&self, enc: &mut T) -> Result<(), T::Err> {
501 0 : // write decrement first to avoid a race condition where inc - dec < 0
502 0 : T::write_help(enc, A::DEC_NAME, A::DEC_HELP)?;
503 0 : self.vec
504 0 : .collect_family_into(A::DEC_NAME, &mut Dec(&mut *enc))?;
505 :
506 0 : T::write_help(enc, A::INC_NAME, A::INC_HELP)?;
507 0 : self.vec
508 0 : .collect_family_into(A::INC_NAME, &mut Inc(&mut *enc))?;
509 :
510 0 : Ok(())
511 0 : }
512 : }
513 :
514 : #[derive(MetricGroup, Default)]
515 : pub struct MeasuredCounterPairState {
516 : pub inc: CounterState,
517 : pub dec: CounterState,
518 : }
519 :
520 : impl measured::metric::MetricType for MeasuredCounterPairState {
521 : type Metadata = ();
522 : }
523 :
524 : pub struct MeasuredCounterPairGuard<'a, A: CounterPairAssoc> {
525 : vec: &'a measured::metric::MetricVec<MeasuredCounterPairState, A::LabelGroupSet>,
526 : id: measured::metric::LabelId<A::LabelGroupSet>,
527 : }
528 :
529 : impl<A: CounterPairAssoc> Drop for MeasuredCounterPairGuard<'_, A> {
530 0 : fn drop(&mut self) {
531 0 : self.vec.get_metric(self.id).dec.inc();
532 0 : }
533 : }
534 :
535 : /// [`MetricEncoding`] for [`MeasuredCounterPairState`] that only writes the inc counter to the inner encoder.
536 : struct Inc<T>(T);
537 : /// [`MetricEncoding`] for [`MeasuredCounterPairState`] that only writes the dec counter to the inner encoder.
538 : struct Dec<T>(T);
539 :
540 : impl<T: Encoding> Encoding for Inc<T> {
541 : type Err = T::Err;
542 :
543 0 : fn write_help(&mut self, name: impl MetricNameEncoder, help: &str) -> Result<(), Self::Err> {
544 0 : self.0.write_help(name, help)
545 0 : }
546 :
547 0 : fn write_metric_value(
548 0 : &mut self,
549 0 : name: impl MetricNameEncoder,
550 0 : labels: impl LabelGroup,
551 0 : value: MetricValue,
552 0 : ) -> Result<(), Self::Err> {
553 0 : self.0.write_metric_value(name, labels, value)
554 0 : }
555 : }
556 :
557 : impl<T: Encoding> MetricEncoding<Inc<T>> for MeasuredCounterPairState
558 : where
559 : CounterState: MetricEncoding<T>,
560 : {
561 0 : fn write_type(name: impl MetricNameEncoder, enc: &mut Inc<T>) -> Result<(), T::Err> {
562 0 : CounterState::write_type(name, &mut enc.0)
563 0 : }
564 0 : fn collect_into(
565 0 : &self,
566 0 : metadata: &(),
567 0 : labels: impl LabelGroup,
568 0 : name: impl MetricNameEncoder,
569 0 : enc: &mut Inc<T>,
570 0 : ) -> Result<(), T::Err> {
571 0 : self.inc.collect_into(metadata, labels, name, &mut enc.0)
572 0 : }
573 : }
574 :
575 : impl<T: Encoding> Encoding for Dec<T> {
576 : type Err = T::Err;
577 :
578 0 : fn write_help(&mut self, name: impl MetricNameEncoder, help: &str) -> Result<(), Self::Err> {
579 0 : self.0.write_help(name, help)
580 0 : }
581 :
582 0 : fn write_metric_value(
583 0 : &mut self,
584 0 : name: impl MetricNameEncoder,
585 0 : labels: impl LabelGroup,
586 0 : value: MetricValue,
587 0 : ) -> Result<(), Self::Err> {
588 0 : self.0.write_metric_value(name, labels, value)
589 0 : }
590 : }
591 :
592 : /// Write the dec counter to the encoder
593 : impl<T: Encoding> MetricEncoding<Dec<T>> for MeasuredCounterPairState
594 : where
595 : CounterState: MetricEncoding<T>,
596 : {
597 0 : fn write_type(name: impl MetricNameEncoder, enc: &mut Dec<T>) -> Result<(), T::Err> {
598 0 : CounterState::write_type(name, &mut enc.0)
599 0 : }
600 0 : fn collect_into(
601 0 : &self,
602 0 : metadata: &(),
603 0 : labels: impl LabelGroup,
604 0 : name: impl MetricNameEncoder,
605 0 : enc: &mut Dec<T>,
606 0 : ) -> Result<(), T::Err> {
607 0 : self.dec.collect_into(metadata, labels, name, &mut enc.0)
608 0 : }
609 : }
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