Upgrade to Go 1.15

[kakkoyun]

Signed-off-by: Kemal Akkoyun kakkoyun@gmail.com

• I added CHANGELOG entry for this change.

https://golang.org/doc/go1.15#compiler

Go 1.15 reduces typical binary sizes by around 5% compared to Go 1.14 by eliminating certain types of GC metadata and more aggressively eliminating unused type metadata.

1.14.7

1.15.0

Changes

• Upgrade use go version
• Upgrade promu version
• Upgrade CI go version

Verification

• make build
• make test-local

[kakkoyun]

Somehow Netlify builds use Go and jobs fail. I couldn't figure where it's specified.

[kakkoyun]

Found the reason of Netlify failures https://github.com/netlify/build-image/blob/450c24b893036c2813a0b0d0a2a05bcdd81935a4/run-build-functions.sh
Netlify uses https://github.com/netlify/gimme to install Go and gimme Go version is listed as 1.15 which is specified in .go-version

[yeya24]

Do we use Kubernetes in our tests?

[kakkoyun]

I have copied those from .gitignore. I haven't checked them to be honest.

[kakkoyun]

There's a failing test. I need to check the underlying cause.

--- FAIL: TestRoundTripSplitIntervalMiddleware (0.00s)
    --- FAIL: TestRoundTripSplitIntervalMiddleware/split_to_2_requests (0.00s)
        roundtrip_test.go:269: roundtrip_test.go:269:
            
            	exp: 2
            
            	got: 1

[yeya24]

There's a failing test. I need to check the underlying cause.

--- FAIL: TestRoundTripSplitIntervalMiddleware (0.00s)
    --- FAIL: TestRoundTripSplitIntervalMiddleware/split_to_2_requests (0.00s)
        roundtrip_test.go:269: roundtrip_test.go:269:
            
            	exp: 2
            
            	got: 1

@kakkoyun Reported here #3084.

I am checking that now. Please ignore this first.

[bwplotka]

Thank you! LGTM!