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 : $crate::register(Box::new(gauge_vec.clone())).map(|_| gauge_vec)
55 : }};
56 : }
57 :
58 : #[macro_export]
59 : macro_rules! register_uint_gauge {
60 : ($NAME:expr, $HELP:expr $(,)?) => {{
61 : let gauge = $crate::UIntGauge::new($NAME, $HELP).unwrap();
62 : $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 0 : register_int_gauge_vec!(
91 0 : "libmetrics_disk_io_bytes_total",
92 0 : "Bytes written and read from disk, grouped by the operation (read|write)",
93 0 : &["io_operation"]
94 0 : )
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 0 : register_int_gauge!(
100 0 : "libmetrics_maxrss_kb",
101 0 : "Memory usage (Maximum Resident Set Size)"
102 0 : )
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 0 : "libmetrics_build_info",
234 0 : "Build/version information",
235 0 : &["revision", "build_tag"]
236 0 : )
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 : MAXRSS_KB.set(rusage_stats.ru_maxrss);
260 0 : }
261 :
262 0 : fn get_rusage_stats() -> libc::rusage {
263 0 : let mut rusage = std::mem::MaybeUninit::uninit();
264 0 :
265 0 : // SAFETY: kernel will initialize the struct for us
266 0 : unsafe {
267 0 : let ret = libc::getrusage(libc::RUSAGE_SELF, rusage.as_mut_ptr());
268 0 : assert!(ret == 0, "getrusage failed: bad args");
269 0 : rusage.assume_init()
270 0 : }
271 0 : }
272 :
273 : /// Create an [`IntCounterPairVec`] and registers to default registry.
274 : #[macro_export(local_inner_macros)]
275 : macro_rules! register_int_counter_pair_vec {
276 : ($NAME1:expr, $HELP1:expr, $NAME2:expr, $HELP2:expr, $LABELS_NAMES:expr $(,)?) => {{
277 : match (
278 : $crate::register_int_counter_vec!($NAME1, $HELP1, $LABELS_NAMES),
279 : $crate::register_int_counter_vec!($NAME2, $HELP2, $LABELS_NAMES),
280 : ) {
281 : (Ok(inc), Ok(dec)) => Ok($crate::IntCounterPairVec::new(inc, dec)),
282 : (Err(e), _) | (_, Err(e)) => Err(e),
283 : }
284 : }};
285 : }
286 :
287 : /// Create an [`IntCounterPair`] and registers to default registry.
288 : #[macro_export(local_inner_macros)]
289 : macro_rules! register_int_counter_pair {
290 : ($NAME1:expr, $HELP1:expr, $NAME2:expr, $HELP2:expr $(,)?) => {{
291 : match (
292 : $crate::register_int_counter!($NAME1, $HELP1),
293 : $crate::register_int_counter!($NAME2, $HELP2),
294 : ) {
295 : (Ok(inc), Ok(dec)) => Ok($crate::IntCounterPair::new(inc, dec)),
296 : (Err(e), _) | (_, Err(e)) => Err(e),
297 : }
298 : }};
299 : }
300 :
301 : /// A Pair of [`GenericCounterVec`]s. Like an [`GenericGaugeVec`] but will always observe changes
302 : pub struct GenericCounterPairVec<P: Atomic> {
303 : inc: GenericCounterVec<P>,
304 : dec: GenericCounterVec<P>,
305 : }
306 :
307 : /// A Pair of [`GenericCounter`]s. Like an [`GenericGauge`] but will always observe changes
308 : pub struct GenericCounterPair<P: Atomic> {
309 : inc: GenericCounter<P>,
310 : dec: GenericCounter<P>,
311 : }
312 :
313 : impl<P: Atomic> GenericCounterPairVec<P> {
314 110 : pub fn new(inc: GenericCounterVec<P>, dec: GenericCounterVec<P>) -> Self {
315 110 : Self { inc, dec }
316 110 : }
317 :
318 : /// `get_metric_with_label_values` returns the [`GenericCounterPair<P>`] for the given slice
319 : /// of label values (same order as the VariableLabels in Desc). If that combination of
320 : /// label values is accessed for the first time, a new [`GenericCounterPair<P>`] is created.
321 : ///
322 : /// An error is returned if the number of label values is not the same as the
323 : /// number of VariableLabels in Desc.
324 1064 : pub fn get_metric_with_label_values(
325 1064 : &self,
326 1064 : vals: &[&str],
327 1064 : ) -> prometheus::Result<GenericCounterPair<P>> {
328 1064 : Ok(GenericCounterPair {
329 1064 : inc: self.inc.get_metric_with_label_values(vals)?,
330 1064 : dec: self.dec.get_metric_with_label_values(vals)?,
331 : })
332 1064 : }
333 :
334 : /// `with_label_values` works as `get_metric_with_label_values`, but panics if an error
335 : /// occurs.
336 510 : pub fn with_label_values(&self, vals: &[&str]) -> GenericCounterPair<P> {
337 510 : self.get_metric_with_label_values(vals).unwrap()
338 510 : }
339 :
340 22 : pub fn remove_label_values(&self, res: &mut [prometheus::Result<()>; 2], vals: &[&str]) {
341 22 : res[0] = self.inc.remove_label_values(vals);
342 22 : res[1] = self.dec.remove_label_values(vals);
343 22 : }
344 : }
345 :
346 : impl<P: Atomic> GenericCounterPair<P> {
347 0 : pub fn new(inc: GenericCounter<P>, dec: GenericCounter<P>) -> Self {
348 0 : Self { inc, dec }
349 0 : }
350 :
351 : /// Increment the gauge by 1, returning a guard that decrements by 1 on drop.
352 510 : pub fn guard(&self) -> GenericCounterPairGuard<P> {
353 510 : self.inc.inc();
354 510 : GenericCounterPairGuard(self.dec.clone())
355 510 : }
356 :
357 : /// Increment the gauge by n, returning a guard that decrements by n on drop.
358 0 : pub fn guard_by(&self, n: P::T) -> GenericCounterPairGuardBy<P> {
359 0 : self.inc.inc_by(n);
360 0 : GenericCounterPairGuardBy(self.dec.clone(), n)
361 0 : }
362 :
363 : /// Increase the gauge by 1.
364 : #[inline]
365 2388 : pub fn inc(&self) {
366 2388 : self.inc.inc();
367 2388 : }
368 :
369 : /// Decrease the gauge by 1.
370 : #[inline]
371 2027 : pub fn dec(&self) {
372 2027 : self.dec.inc();
373 2027 : }
374 :
375 : /// Add the given value to the gauge. (The value can be
376 : /// negative, resulting in a decrement of the gauge.)
377 : #[inline]
378 0 : pub fn inc_by(&self, v: P::T) {
379 0 : self.inc.inc_by(v);
380 0 : }
381 :
382 : /// Subtract the given value from the gauge. (The value can be
383 : /// negative, resulting in an increment of the gauge.)
384 : #[inline]
385 0 : pub fn dec_by(&self, v: P::T) {
386 0 : self.dec.inc_by(v);
387 0 : }
388 : }
389 :
390 : impl<P: Atomic> Clone for GenericCounterPair<P> {
391 4389 : fn clone(&self) -> Self {
392 4389 : Self {
393 4389 : inc: self.inc.clone(),
394 4389 : dec: self.dec.clone(),
395 4389 : }
396 4389 : }
397 : }
398 :
399 : /// Guard returned by [`GenericCounterPair::guard`]
400 : pub struct GenericCounterPairGuard<P: Atomic>(GenericCounter<P>);
401 :
402 : impl<P: Atomic> Drop for GenericCounterPairGuard<P> {
403 510 : fn drop(&mut self) {
404 510 : self.0.inc();
405 510 : }
406 : }
407 : /// Guard returned by [`GenericCounterPair::guard_by`]
408 : pub struct GenericCounterPairGuardBy<P: Atomic>(GenericCounter<P>, P::T);
409 :
410 : impl<P: Atomic> Drop for GenericCounterPairGuardBy<P> {
411 0 : fn drop(&mut self) {
412 0 : self.0.inc_by(self.1);
413 0 : }
414 : }
415 :
416 : /// A Pair of [`IntCounterVec`]s. Like an [`IntGaugeVec`] but will always observe changes
417 : pub type IntCounterPairVec = GenericCounterPairVec<AtomicU64>;
418 :
419 : /// A Pair of [`IntCounter`]s. Like an [`IntGauge`] but will always observe changes
420 : pub type IntCounterPair = GenericCounterPair<AtomicU64>;
421 :
422 : /// A guard for [`IntCounterPair`] that will decrement the gauge on drop
423 : pub type IntCounterPairGuard = GenericCounterPairGuard<AtomicU64>;
424 :
425 : pub trait CounterPairAssoc {
426 : const INC_NAME: &'static MetricName;
427 : const DEC_NAME: &'static MetricName;
428 :
429 : const INC_HELP: &'static str;
430 : const DEC_HELP: &'static str;
431 :
432 : type LabelGroupSet: LabelGroupSet;
433 : }
434 :
435 : pub struct CounterPairVec<A: CounterPairAssoc> {
436 : vec: measured::metric::MetricVec<MeasuredCounterPairState, A::LabelGroupSet>,
437 : }
438 :
439 : impl<A: CounterPairAssoc> Default for CounterPairVec<A>
440 : where
441 : A::LabelGroupSet: Default,
442 : {
443 216 : fn default() -> Self {
444 216 : Self {
445 216 : vec: Default::default(),
446 216 : }
447 216 : }
448 : }
449 :
450 : impl<A: CounterPairAssoc> CounterPairVec<A> {
451 0 : pub fn guard(
452 0 : &self,
453 0 : labels: <A::LabelGroupSet as LabelGroupSet>::Group<'_>,
454 0 : ) -> MeasuredCounterPairGuard<'_, A> {
455 0 : let id = self.vec.with_labels(labels);
456 0 : self.vec.get_metric(id).inc.inc();
457 0 : MeasuredCounterPairGuard { vec: &self.vec, id }
458 0 : }
459 0 : pub fn inc(&self, labels: <A::LabelGroupSet as LabelGroupSet>::Group<'_>) {
460 0 : let id = self.vec.with_labels(labels);
461 0 : self.vec.get_metric(id).inc.inc();
462 0 : }
463 0 : pub fn dec(&self, labels: <A::LabelGroupSet as LabelGroupSet>::Group<'_>) {
464 0 : let id = self.vec.with_labels(labels);
465 0 : self.vec.get_metric(id).dec.inc();
466 0 : }
467 0 : pub fn remove_metric(
468 0 : &self,
469 0 : labels: <A::LabelGroupSet as LabelGroupSet>::Group<'_>,
470 0 : ) -> Option<MeasuredCounterPairState> {
471 0 : let id = self.vec.with_labels(labels);
472 0 : self.vec.remove_metric(id)
473 0 : }
474 : }
475 :
476 : impl<T, A> ::measured::metric::group::MetricGroup<T> for CounterPairVec<A>
477 : where
478 : T: ::measured::metric::group::Encoding,
479 : A: CounterPairAssoc,
480 : ::measured::metric::counter::CounterState: ::measured::metric::MetricEncoding<T>,
481 : {
482 0 : fn collect_group_into(&self, enc: &mut T) -> Result<(), T::Err> {
483 0 : // write decrement first to avoid a race condition where inc - dec < 0
484 0 : T::write_help(enc, A::DEC_NAME, A::DEC_HELP)?;
485 0 : self.vec
486 0 : .collect_family_into(A::DEC_NAME, &mut Dec(&mut *enc))?;
487 :
488 0 : T::write_help(enc, A::INC_NAME, A::INC_HELP)?;
489 0 : self.vec
490 0 : .collect_family_into(A::INC_NAME, &mut Inc(&mut *enc))?;
491 :
492 0 : Ok(())
493 0 : }
494 : }
495 :
496 : #[derive(MetricGroup, Default)]
497 : pub struct MeasuredCounterPairState {
498 : pub inc: CounterState,
499 : pub dec: CounterState,
500 : }
501 :
502 : impl measured::metric::MetricType for MeasuredCounterPairState {
503 : type Metadata = ();
504 : }
505 :
506 : pub struct MeasuredCounterPairGuard<'a, A: CounterPairAssoc> {
507 : vec: &'a measured::metric::MetricVec<MeasuredCounterPairState, A::LabelGroupSet>,
508 : id: measured::metric::LabelId<A::LabelGroupSet>,
509 : }
510 :
511 : impl<A: CounterPairAssoc> Drop for MeasuredCounterPairGuard<'_, A> {
512 0 : fn drop(&mut self) {
513 0 : self.vec.get_metric(self.id).dec.inc();
514 0 : }
515 : }
516 :
517 : /// [`MetricEncoding`] for [`MeasuredCounterPairState`] that only writes the inc counter to the inner encoder.
518 : struct Inc<T>(T);
519 : /// [`MetricEncoding`] for [`MeasuredCounterPairState`] that only writes the dec counter to the inner encoder.
520 : struct Dec<T>(T);
521 :
522 : impl<T: Encoding> Encoding for Inc<T> {
523 : type Err = T::Err;
524 :
525 0 : fn write_help(&mut self, name: impl MetricNameEncoder, help: &str) -> Result<(), Self::Err> {
526 0 : self.0.write_help(name, help)
527 0 : }
528 :
529 0 : fn write_metric_value(
530 0 : &mut self,
531 0 : name: impl MetricNameEncoder,
532 0 : labels: impl LabelGroup,
533 0 : value: MetricValue,
534 0 : ) -> Result<(), Self::Err> {
535 0 : self.0.write_metric_value(name, labels, value)
536 0 : }
537 : }
538 :
539 : impl<T: Encoding> MetricEncoding<Inc<T>> for MeasuredCounterPairState
540 : where
541 : CounterState: MetricEncoding<T>,
542 : {
543 0 : fn write_type(name: impl MetricNameEncoder, enc: &mut Inc<T>) -> Result<(), T::Err> {
544 0 : CounterState::write_type(name, &mut enc.0)
545 0 : }
546 0 : fn collect_into(
547 0 : &self,
548 0 : metadata: &(),
549 0 : labels: impl LabelGroup,
550 0 : name: impl MetricNameEncoder,
551 0 : enc: &mut Inc<T>,
552 0 : ) -> Result<(), T::Err> {
553 0 : self.inc.collect_into(metadata, labels, name, &mut enc.0)
554 0 : }
555 : }
556 :
557 : impl<T: Encoding> Encoding for Dec<T> {
558 : type Err = T::Err;
559 :
560 0 : fn write_help(&mut self, name: impl MetricNameEncoder, help: &str) -> Result<(), Self::Err> {
561 0 : self.0.write_help(name, help)
562 0 : }
563 :
564 0 : fn write_metric_value(
565 0 : &mut self,
566 0 : name: impl MetricNameEncoder,
567 0 : labels: impl LabelGroup,
568 0 : value: MetricValue,
569 0 : ) -> Result<(), Self::Err> {
570 0 : self.0.write_metric_value(name, labels, value)
571 0 : }
572 : }
573 :
574 : /// Write the dec counter to the encoder
575 : impl<T: Encoding> MetricEncoding<Dec<T>> for MeasuredCounterPairState
576 : where
577 : CounterState: MetricEncoding<T>,
578 : {
579 0 : fn write_type(name: impl MetricNameEncoder, enc: &mut Dec<T>) -> Result<(), T::Err> {
580 0 : CounterState::write_type(name, &mut enc.0)
581 0 : }
582 0 : fn collect_into(
583 0 : &self,
584 0 : metadata: &(),
585 0 : labels: impl LabelGroup,
586 0 : name: impl MetricNameEncoder,
587 0 : enc: &mut Dec<T>,
588 0 : ) -> Result<(), T::Err> {
589 0 : self.dec.collect_into(metadata, labels, name, &mut enc.0)
590 0 : }
591 : }
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