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6c565343f7
* feat(x/metrics): add module for emiting custom chain metrics (#1668)
* initialize x/metrics with metrics collection
* include global labels in x/metrics metrics
* add x/metrics spec
* add x/metrics test coverage
* update changelog
(cherry picked from commit 9a0aed7626)
# Conflicts:
# CHANGELOG.md
* fix changlog conflicts
---------
Co-authored-by: Robert Pirtle <Astropirtle@gmail.com>
37 lines
1.2 KiB
Markdown
37 lines
1.2 KiB
Markdown
<!--
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order: 0
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title: "Metrics Overview"
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parent:
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title: "metrics"
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-->
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# `metrics`
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## Abstract
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`x/metrics` is a stateless module that does not affect consensus. It captures chain metrics and emits them when the `instrumentation.prometheus` option is enabled in `config.toml`.
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## Precision
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The metrics emitted by `x/metrics` are `float64`s. They use `github.com/go-kit/kit/metrics` Prometheus gauges. Cosmos-sdk's `telemetry` package was not used because, at the time of writing, it only supports `float32`s and so does not maintain accurate representations of ints larger than ~16.8M. With `float64`s, integers may be accurately represented up to ~9e15.
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## Metrics
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The following metrics are defined:
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* `cometbft_blocksync_latest_block_height` - this emulates the blocksync `latest_block_height` metric in CometBFT v0.38+. The `cometbft` namespace comes from the `instrumentation.namespace` config.toml value.
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## Metric Labels
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All metrics emitted have the labels defined in app.toml's `telemetry.global-labels` field. This is the same field used by cosmos-sdk's `telemetry` package.
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example:
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```toml
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# app.toml
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[telemetry]
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global-labels = [
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["chain_id", "kava_2222-10"],
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["my_label", "my_value"],
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]
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```
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