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Fix/expand a few comments

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This commit is contained in:
James Wilson
2021-08-12 16:20:05 +01:00
parent 230987036a
commit 05a3ba3fef
3 changed files with 11 additions and 8 deletions
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backend/telemetry_core/src/main.rs
+5 -2
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@@ -485,13 +485,16 @@ where
async fn return_prometheus_metrics(aggregator: AggregatorSet) -> Response<hyper::Body> {
let metrics = aggregator.latest_metrics();
// Instead of using the rust prometheus library, we just split out the text format that prometheus expects
// ourselves, using whatever the latest metrics that we've captured so far are. See:
// Instead of using the rust prometheus library (which is optimised around global variables updated across a codebase),
// we just split out the text format that prometheus expects ourselves, using whatever the latest metrics that we've
// captured so far from the aggregators are. See:
//
// https://github.com/prometheus/docs/blob/master/content/docs/instrumenting/exposition_formats.md#text-format-details
//
// For an example and explanation of this text based format. The minimal output we produce here seems to
// be handled correctly when pointing a current version of prometheus at it.
//
// Note: '{{' and '}}' are just escaped versions of '{' and '}' in Rust fmt strings.
let mut s = String::new();
for (idx, m) in metrics.iter().enumerate() {
s.push_str(&format!(