Add metric to count the number of rate-limited transactions - #839
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""" WalkthroughA new Prometheus counter metric was added to track the total number of rate-limited transactions. The Collector interface and its implementations were updated to support this metric. The requester service now records rate-limited transactions using the new method without EOA-specific labeling. Changes
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Actionable comments posted: 0
🧹 Nitpick comments (1)
metrics/collector.go (1)
80-83: Consider the cardinality implications of using EOA addresses as labels.The metric definition is correct, but using EOA addresses as labels could potentially create a high-cardinality metric if there are many unique addresses that get rate-limited. This might impact Prometheus performance and storage requirements.
Consider implementing a cardinality limit or monitoring the number of unique labels to ensure it stays within acceptable bounds.
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metrics/collector.go(6 hunks)metrics/nop.go(1 hunks)services/requester/requester.go(1 hunks)
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🔇 Additional comments (7)
metrics/collector.go (5)
99-99: LGTM: Metric properly registered.The new metric is correctly added to the metrics slice for registration.
115-115: LGTM: Interface extension is well-defined.The method signature is clear and follows the existing naming convention.
135-135: LGTM: Struct field addition is consistent.The field follows the same naming pattern as other metric fields in the struct.
158-158: LGTM: Constructor initialization is correct.The new metric field is properly initialized in the constructor.
233-237: LGTM: Method implementation is correct.The implementation correctly uses prometheus.Labels with the address parameter and increments the counter. The pattern matches other similar methods in the file.
metrics/nop.go (1)
27-27: LGTM: No-op implementation is correct.The empty implementation correctly satisfies the interface requirement for scenarios where metrics collection is disabled.
services/requester/requester.go (1)
222-222: LGTM: Improved metric granularity for rate limiting.The change from generic method-based rate limiting metrics to EOA-specific tracking provides better observability. Using
from.Hex()correctly identifies the rate-limited account.
| Help: "Total number of rate limits by JSON-RPC method", | ||
| }, []string{"method"}) | ||
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| var eoaRateLimitedTransactions = prometheus.NewCounterVec(prometheus.CounterOpts{ |
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I am using a CounterVec here, not sure if a GaugeVec would be preferable though.
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no, counter is the right type for this
| Help: "Total number of rate limits by JSON-RPC method", | ||
| }, []string{"method"}) | ||
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| var eoaRateLimitedTransactions = prometheus.NewCounterVec(prometheus.CounterOpts{ |
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no, counter is the right type for this
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| func (c *DefaultCollector) EOARateLimited(address string) { | ||
| c.eoaRateLimitedTransactions. | ||
| With(prometheus.Labels{"address": address}). |
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let's not include the address as a label. I think it's fine to just have a regular counter.
as a best practice, don't include arbitrary fields as labels otherwise prometheus will a separate metric for each address. On a high volume server, this can create a huge number of metrics.
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Good point 👍 Updated in a74c713 .
I used a plain prometheus.Counter instead of a prometheus.CounterVec, since we don't need any labels.
m-Peter
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Closes: #838
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