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Global error handler cleanup - exponential histogram #2235

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Merged
lalitb merged 6 commits into from
Oct 24, 2024
Merged

Global error handler cleanup - exponential histogram #2235

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d48133f
metrics-sdk-error
lalitb Oct 24, 2024
502885e
Merge branch 'main' into exp-hist-internal-log
lalitb Oct 24, 2024
76a02a1
Merge branch 'main' into exp-hist-internal-log
TommyCpp Oct 24, 2024
bde6dd1
Update opentelemetry-sdk/src/metrics/internal/exponential_histogram.rs
lalitb Oct 24, 2024
4bab7f5
review comment
lalitb Oct 24, 2024
0a39b3b
Merge branch 'main' into exp-hist-internal-log
lalitb Oct 24, 2024
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17 changes: 13 additions & 4 deletions opentelemetry-sdk/src/metrics/internal/exponential_histogram.rs
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Original file line number Diff line number Diff line change
@@ -1,7 +1,7 @@
use std::{collections::HashMap, f64::consts::LOG2_E, sync::Mutex, time::SystemTime};

use once_cell::sync::Lazy;
use opentelemetry::{metrics::MetricsError, KeyValue};
use opentelemetry::{otel_debug, KeyValue};

use crate::{
metrics::data::{self, Aggregation, Temporality},
Expand Down Expand Up @@ -100,9 +100,18 @@
if (self.scale - scale_delta as i8) < EXPO_MIN_SCALE {
// With a scale of -10 there is only two buckets for the whole range of f64 values.
// This can only happen if there is a max size of 1.
opentelemetry::global::handle_error(MetricsError::Other(
"exponential histogram scale underflow".into(),
));

// TODO - to check if this should be logged as an error if this is auto-recoverable.
otel_debug!(

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name: "ExponentialHistogramDataPoint.Scale.Underflow",
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@TommyCpp TommyCpp Oct 24, 2024

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It seems the naming convention is CamelCase. for log names. Is there a reason here?

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@lalitb lalitb Oct 24, 2024 •
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There are no specific reasons; it simply offers clearer visibility and effectively represents hierarchy when combined with dots. For example, ExponentialHistogramDataPoint.Scale.Underflow seems better to exponentialhistogramdatapoint.scale.underflow or exponential_histogram_datapoint.scale.underflow.

Or better example to represent hierarch would be LoggerProvider.Drop.ShutdownMutexPoisoned as compared to loggerprovider.drop.shutdownmutexpoisoned
But happy to change if there are specific guidelines/preferences.

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@lalitb lalitb Oct 24, 2024

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@TommyCpp - I am merging this to unblock. If there are specific recommendations, we can cover separately as this will affect throughout.

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@cijothomas cijothomas Oct 25, 2024

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We can get some inputs from OTel Events team recommendations. Our event name is same as what OTel Events are. (There are lot of ongoing discussions in this area, so we need to comeback to this once things are more settled)

current_scale = self.scale,
scale_delta = scale_delta,
max_size = self.max_size,
min_scale = EXPO_MIN_SCALE,
value = format!("{:?}", v),

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message = "The measurement will be dropped due to scale underflow. Check the histogram configuration"
);
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@lalitb lalitb Oct 24, 2024

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Cijo's comment:
Unless we are 100% sure this cannot cause flooding of logs, lets remove the log from here, and leave a TODO to add logging once we understand more.

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@lalitb lalitb Oct 24, 2024

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I prefer to log as otel_debug till we are not sure.


return;
}
// Downscale
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