MeiliSearch/meilisearch-http/src/metrics.rs

use lazy_static::lazy_static;
use prometheus::{opts, register_histogram_vec, register_int_counter_vec, register_int_gauge, register_int_gauge_vec};
use prometheus::{HistogramVec, IntCounterVec, IntGauge, IntGaugeVec};

const HTTP_RESPONSE_TIME_CUSTOM_BUCKETS: &[f64; 14] = &[
    0.0005, 0.0008, 0.00085, 0.0009, 0.00095, 0.001, 0.00105, 0.0011, 0.00115, 0.0012, 0.0015,
    0.002, 0.003, 1.0,
];

lazy_static! {
    pub static ref HTTP_REQUESTS_TOTAL: IntCounterVec = register_int_counter_vec!(
        opts!("http_requests_total", "HTTP requests total"),
        &["method", "path"]
    )
    .expect("Can't create a metric");

    pub static ref MEILISEARCH_DB_SIZE: IntGauge = register_int_gauge!(
        opts!("meilisearch_database_size", "MeiliSearch Stats DbSize")
    )
    .expect("Can't create a metric");

    pub static ref MEILISEARCH_INDEX_COUNT: IntGauge = register_int_gauge!(
        opts!("meilisearch_total_index", "MeiliSearch Stats Index Count")
    )
    .expect("Can't create a metric");

    pub static ref MEILISEARCH_DOCS_COUNT: IntGaugeVec = register_int_gauge_vec!(
        opts!("meilisearch_docs_count", "MeiliSearch Stats Docs Count"),
        &["index"]
    )
    .expect("Can't create a metric");

    pub static ref HTTP_RESPONSE_TIME_SECONDS: HistogramVec = register_histogram_vec!(
        "http_response_time_seconds",
        "HTTP response times",
        &["method", "path"],
        HTTP_RESPONSE_TIME_CUSTOM_BUCKETS.to_vec()
    )
    .expect("Can't create a metric");
}