Update dependency Prometheus.Client to v3

[renovate]

This PR contains the following updates:

Package	Type	Update	Change	References
Prometheus.Client	nuget	major	2.2.2 -> 3.0.0	source

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Release Notes

PrometheusClientNet/Prometheus.Client

v3.0.0

Compare Source

This major release dedicated mostly to reduce memory allocation especially while scrape collection to achieve this we made number of improvements and breaking changes.

Improvements:

• Introduced IMetricsWriter, which used to produce metric samples without creation of CMetricFamily.
• Added target to netcore2.2 which allow us to use non-allocating format methods. This dramatically reduces allocation while scrapping for application run on netcore2.2.
• ICollectorRegistry and ICollector interfaces were reviewed.
• Histogram and Summary now expose current state through Value property (which returns snapshot of the state).
• Added CounterInt64 - counter optimized for integer values. It uses atomic operations instead of optimistic lock on value increment.
• Added IValueObserver abstraction for Histogram and Summary, together with extension methods for convenient duration observation.
• All value observation methods now support explicit setting timestamp for the observation.
• Fluent syntax to register default collectors into the CollectorRegistry.
• Reviewed MetricFactory to avoid unnecessary metric creation before checking CollectorRegistry for existing one.
• Improved unit tests coverage and added benchmarks.
• Library is Strong Named now.

Breaking changes:

• Legacy .Net Framework 4.5 is not supported anymore.
• Removed PerfCounter collectors as a platform dependent feature.
• Removed all Contracts because of moving to IMetricsWriter.
• TextFormatter was removed in favor of MetricsTextWriter.
• CollectorRegistry.Instance was moved into Metrics.DefaultCollectorRegistry to isolate all static API into Metrics entry point.
• Base classes Collector and Labelled have lots of changes to correspond new API and reduce allocation.
• IOnDemandCollector was removed in favor of ICollector.
• ScrapeHandler.Process methods is async now to follow .NET Core 3.0 synchronous operations restrictions.

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[promitor-bot]

Docker image for this PR was built and is available on Docker Hub.

You can pull it locally via the CLI:

docker pull tomkerkhove/promitor-agent-scraper-ci:pr523

Want to verify the new version? Run it locally:

docker run -d -p 8999:80 --name promitor-agent-scraper-pr523 \
                         --env PROMITOR_AUTH_APPID='<azure-ad-app-id>' \
                         --env PROMITOR_AUTH_APPKEY='<azure-ad-app-key>' \
                         --volume C:/Promitor/metrics-declaration.yaml:/config/metrics-declaration.yaml \
                         tomkerkhove/promitor-agent-scraper-ci:pr523

[promitor-bot]

Docker image for this PR was built and is available on Docker Hub.

You can pull it locally via the CLI:

docker pull tomkerkhove/promitor-agent-scraper-ci:pr523

Want to verify the new version? Run it locally:

docker run -d -p 8999:80 --name promitor-agent-scraper-pr523 \
                         --env PROMITOR_AUTH_APPID='<azure-ad-app-id>' \
                         --env PROMITOR_AUTH_APPKEY='<azure-ad-app-key>' \
                         --volume C:/Promitor/metrics-declaration.yaml:/config/metrics-declaration.yaml \
                         tomkerkhove/promitor-agent-scraper-ci:pr523