4530: fix: set the histogram bucket boundaries to follow the otel spec r=curquiza a=rohankmr414

# Pull Request

## What does this PR do?
- Fixes the http request duration histogram bucket boundaries to follow the opentelemetry spec, currently the bucket boundaries are too granular and only track latencies below 1s.

## PR checklist
Please check if your PR fulfills the following requirements:
- [ ] Does this PR fix an existing issue, or have you listed the changes applied in the PR description (and why they are needed)?
- [x] Have you read the contributing guidelines?
- [x] Have you made sure that the title is accurate and descriptive of the changes?

Thank you so much for contributing to Meilisearch!


Co-authored-by: Rohan Kumar <rohankmr414@gmail.com>
This commit is contained in:
meili-bors[bot] 2024-03-25 12:23:31 +00:00 committed by GitHub
commit 5ea017b922
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@ -4,19 +4,7 @@ use prometheus::{
register_int_gauge_vec, HistogramVec, IntCounterVec, IntGauge, IntGaugeVec,
};
/// Create evenly distributed buckets
fn create_buckets() -> [f64; 29] {
(0..10)
.chain((10..100).step_by(10))
.chain((100..=1000).step_by(100))
.map(|i| i as f64 / 1000.)
.collect::<Vec<_>>()
.try_into()
.unwrap()
}
lazy_static! {
pub static ref MEILISEARCH_HTTP_RESPONSE_TIME_CUSTOM_BUCKETS: [f64; 29] = create_buckets();
pub static ref MEILISEARCH_HTTP_REQUESTS_TOTAL: IntCounterVec = register_int_counter_vec!(
opts!("meilisearch_http_requests_total", "Meilisearch HTTP requests total"),
&["method", "path", "status"]
@ -47,7 +35,7 @@ lazy_static! {
"meilisearch_http_response_time_seconds",
"Meilisearch HTTP response times",
&["method", "path"],
MEILISEARCH_HTTP_RESPONSE_TIME_CUSTOM_BUCKETS.to_vec()
vec![0.005, 0.01, 0.025, 0.05, 0.075, 0.1, 0.25, 0.5, 0.75, 1.0, 2.5, 5.0, 7.5, 10.0]
)
.expect("Can't create a metric");
pub static ref MEILISEARCH_NB_TASKS: IntGaugeVec = register_int_gauge_vec!(