OpenTelemetry v0.18 compatible version

Merge pull request #56 from hellofresh/EES-5434

Bumped OpenTelemetry to v0.18

Memcached health check

• Memcached health check support (thx to @mecitsemerci)
• OpenTelemetry v0.16

OpenTelemetry 0.15 compatible version

Merge pull request #53 from hellofresh/patch/ot-0.15

EES-4724 Updated deps to have latest stable OpenTelemetry version

Context-aware checks

• No more package-level vars - health-checks container should be instantiated first
• Configure health-checks container with options
• Tracing support to track how long every individual check takes
• Checks are context-aware
• Added new Postgres check implementation based on pgx/v4

gRPC check implementation

Merge pull request #45 from hellofresh/feature/grpc

Added gRPC check implementation

Switch to go-redis client as gomodule removed version being used

Fixes #43

Expose method to run health checks w/out HTTP handler

Merge pull request #41 from hellofresh/feature/expose-check

EES-3610 Expose method to run health checks w/out HTTP handler

Return wrapped errors instead of logging

• No more internal logging - return wrapped errors instead.
• Proper go modules versioning.

Fixed MySQL and PG connections leak

Merge pull request #31 from hellofresh/hotfix/my-pg-connections-leak

PT-4880 Fixed MySQL and PG connections leak

Officially OSS

Just Apache 2.0 license file added