use crate::metrics::MetricsClient;use crate::metrics::error::Result;use std::time::Instant;#[derive(Debug)]pub struct Timer {    name: String,    tags: Vec<(String, String)>,    client: MetricsClient,    start_time: Instant,}impl Drop for Timer {    fn drop(&mut self) {        if let Err(e) = self.record(&[]) {            tracing::error!("metrics client error: {}", e);        }    }}impl Timer {    pub(crate) fn new(name: &str, tags: &[(&str, &str)], client: &MetricsClient) -> Self {        Self {            name: name.to_string(),            tags: tags                .iter()                .map(|(k, v)| (k.to_string(), v.to_string()))                .collect(),            client: client.clone(),            start_time: Instant::now(),        }    }    pub fn record(&self, additional_tags: &[(&str, &str)]) -> Result<()> {        let mut tags = Vec::with_capacity(self.tags.len() + additional_tags.len());        tags.extend(additional_tags);        tags.extend(self.tags.iter().map(|(k, v)| (k.as_str(), v.as_str())));        self.client            .record_duration(&self.name, self.start_time.elapsed(), &tags)    }}