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feat: add query telemetry #12405

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merged 8 commits into from
Jul 5, 2022
Merged

feat: add query telemetry #12405

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3e257ad
feat: add query telemetry
robert-zaremba Jun 30, 2022
bc943e7
Merge branch 'main' into robert/query-telemetry
robert-zaremba Jul 5, 2022
9bfb9d7
updated telemetry docs
robert-zaremba Jul 5, 2022
4044a1f
update changelog
robert-zaremba Jul 5, 2022
2321625
update link
robert-zaremba Jul 5, 2022
ebbd2da
Merge branch 'main' into robert/query-telemetry
robert-zaremba Jul 5, 2022
ae9a5f0
Add measure since telemetry for queries
robert-zaremba Jul 5, 2022
5edd5b7
Merge branch 'main' into robert/query-telemetry
robert-zaremba Jul 5, 2022
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1 change: 1 addition & 0 deletions CHANGELOG.md
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Expand Up @@ -41,6 +41,7 @@ Ref: https://keepachangelog.com/en/1.0.0/

* (cli) [#12028](https://github.com/cosmos/cosmos-sdk/pull/12028) Add the `tendermint key-migrate` to perform Tendermint v0.35 DB key migration.
* (query) [#12253](https://github.com/cosmos/cosmos-sdk/pull/12253) Add `GenericFilteredPaginate` to the `query` package to improve UX.
* (telemetry) [#12405](https://github.com/cosmos/cosmos-sdk/pull/12405) Add _query_ calls metric to telemetry.

### Improvements

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3 changes: 3 additions & 0 deletions baseapp/abci.go
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Expand Up @@ -388,6 +388,9 @@ func (app *BaseApp) Query(req abci.RequestQuery) (res abci.ResponseQuery) {
req.Height = app.LastBlockHeight()
}

telemetry.IncrCounter(1, "query", "count")
telemetry.IncrCounter(1, "query", req.Path)

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// handle gRPC routes first rather than calling splitPath because '/' characters
// are used as part of gRPC paths
if grpcHandler := app.grpcQueryRouter.Route(req.Path); grpcHandler != nil {
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15 changes: 8 additions & 7 deletions docs/core/telemetry.md
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Expand Up @@ -7,16 +7,17 @@ order: 10
Gather relevant insights about your application and modules with custom metrics and telemetry. {synopsis}

The Cosmos SDK enables operators and developers to gain insight into the performance and behavior of
their application through the use of the `telemetry` package. The Cosmos SDK currently supports
enabling in-memory and prometheus as telemetry sinks. This allows the ability to query for and scrape
metrics from a single exposed API endpoint -- `/metrics?format={text|prometheus}`, the default being
`text`.
their application through the use of the `telemetry` package. To enable telemetrics, set `telemetry.enabled = true` in the app.toml config file.

The Cosmos SDK currently supports enabling in-memory and prometheus as telemetry sinks. In-memory sink is always attached (when the telemetry is enabled) with 10 second interval and 1 minute retention. This means that metrics will be aggregated over 10 seconds, and metrics will be kept alive for 1 minute.
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To query active metrics (see retention note above) you have to enable API server (`api.enabled = true` in the app.toml). Single API endpoint is exposed: `http://localhost:1317/metrics?format={text|prometheus}`, the default being `text`.

## Emitting metrics

If telemetry is enabled via configuration, a single global metrics collector is registered via the
[go-metrics](https://github.com/armon/go-metrics) library. This allows emitting and collecting
metrics through simple API calls.

Example:
metrics through simple [API](https://github.com/cosmos/cosmos-sdk/blob/v0.46.0-rc1/telemetry/wrapper.go). Example:

```go
func EndBlocker(ctx sdk.Context, k keeper.Keeper) {
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