Some small instrumenting improvements

[Hoverbear]

Just some small instrumenting improvements, nothing life changing here.

[lheckemann]

#17 makes the query implement Debug so we probably don't need this extra serialisation stuff?

[Hoverbear]

In this case the proc macro created Variables type is the problem:

   Compiling nxfr-push v0.1.0 (/home/ana/git/determinatesystems/nxfr-push)
error[E0277]: `Variables` doesn't implement `std::fmt::Debug`
   --> src/release_metadata.rs:141:9
    |
141 | /         tracing::trace!(
142 | |             endpoint = %crate::graphql::GITHUB_ENDPOINT,
143 | |             ?query,
144 | |             "Making request"
145 | |         );
    | |         ^
    | |         |
    | |_________`Variables` cannot be formatted using `{:?}`
    |           required by a bound introduced by this call
    |
    = help: the trait `std::fmt::Debug` is not implemented for `Variables`
    = note: add `#[derive(Debug)]` to `Variables` or manually `impl std::fmt::Debug for Variables`
    = help: the trait `std::fmt::Debug` is implemented for `QueryBody<Variables>`
    = note: required for `QueryBody<Variables>` to implement `std::fmt::Debug`
    = note: 1 redundant requirement hidden
    = note: required for `&QueryBody<Variables>` to implement `std::fmt::Debug`
note: required by a bound in `tracing::field::debug`
   --> /home/ana/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tracing-core-0.1.31/src/field.rs:365:8
    |
363 | pub fn debug<T>(t: T) -> DebugValue<T>
    |        ----- required by a bound in this function
364 | where
365 |     T: fmt::Debug,
    |        ^^^^^^^^^^ required by this bound in `debug`
    = note: this error originates in the macro `$crate::valueset` which comes from the expansion of the macro `tracing::trace` (in Nightly builds, run with -Z macro-backtrace for more info)
help: consider annotating `Variables` with `#[derive(Debug)]`
   --> src/graphql/mod.rs:7:10
    |
7   | #[derive(#[derive(Debug)]
    |          ++++++++++++++++

However your question prompted me to dig around and find out that we can set variables_derives:

#[derive(GraphQLQuery)]
#[graphql(
    schema_path = "src/graphql/github_schema.graphql",
    query_path = "src/graphql/rev_count_query.graphql",
    response_derives = "Debug",
    variables_derives = "Debug",
)]
pub(crate) struct RevCountQuery;